The Coco Growing Guide (Maximum Yield), written by Tesla1200W y Nabis In collaboration with NetadripIt is designed so that anyone – novice or experienced – can fully understand how to grow with coconut fiber.

Growing in coco coir might seem complex at first, but think of how much control it gives you! By understanding the basics—from using small pots, water with drainage During each watering, monitor the EC/pH and take advantage of the weather – you have all the levers in your hands to take your cultivation to the next level.

This concise guide covers everything from basic concepts to advanced strategies, explaining terms such as EC, VPD, flushing o crop steering in simple language.

If you're a beginner, focus first on the golden rules and basic daily watering strategyWith that, you will achieve results far superior to conventional soil cultivation.

As you gain confidence, you can start applying more advanced techniques such as multiple irrigations or generative/vegetative adjustments to further maximize the potential of your plants in coco coir.

Remember that every crop is a learning opportunity; observe your plants, keep a record if possible, and don't get frustrated by mistakes (they happen to all of us!).

Coconut fiber, when handled correctly, will reward you with rapid growth, explosive blooms, and abundant, high-quality harvestsAnd perhaps most importantly: it will allow you to better understand the needs of your plants, as you will see almost immediate responses to changes you make in watering and nutrition.

We hope this guide serves as a roadmap for your coco coir adventure. As Tesla and Nabis say, “Our goal is for you to understand each phase and each cycle of cultivation… you’ll see that coco coir has many advantages if you learn to read your plants well and maintain control over watering and nutrition.” Happy growing, and may your roots always be white and healthy!

Introduction: Why irrigation in coco coir is key

Coconut is an inert and highly aerated substrate that, well handledIt can give you spectacular results, but mismanaged It can cause many headaches. The authors make their philosophy clear from the beginning: "Treat coconut like soil and you'll get soil results; treat it like a hydroponic medium and you'll get hydroponic results.".

This means that if you apply soil-based cultivation techniques and mindset, you'll get average yields, but if you take advantage of the benefits of coco coir (frequent watering, precise nutrition, plenty of oxygen at the roots) you can achieve far superior yields.

If you apply soil-based cultivation techniques and mindset, you will obtain average yields, but if you take advantage of the benefits of coco coir (frequent watering, precise nutrition, plenty of oxygen in the roots) you can achieve much higher yields.

Why focus so much on irrigation? Think about this: you can invest in elite genetics, expensive lights, and "miracle" fertilizers, but if you don't master the basics—water and daily nutrition—you won't see results. Just like in sports, the foundation is good nutrition and exercise, in cultivation, the foundation is a... correct irrigation.

Irrigation is not just another mechanical task, It's a daily strategic decision. which determines how the plant eats, drinks, and breathes. That's why the guide insists on starting with the basics: understanding coco coir substrate and the golden rules of watering before trying advanced techniques.

At the end of each section, you'll find a brief summary of the key concepts to reinforce what you've learned. Get comfortable and prepare to learn everything you need to know to successfully grow coconuts!

Fundamentals of coconut cultivation

Coconut is a unique substrate with characteristics that differentiate it from soil. It does not contain any nutrients of its own.Therefore, the plant depends 100% on what you provide through watering. Far from being a disadvantage, this gives you complete control over your plants' nutrition.

Furthermore, coconut fiber has a porous structure that retains a lot of aeration even when wet, which means it is difficult to drown or "overwater" to a plant in coco coir. There will always be oxygen available at the root, preventing suffocation from excess water. Roots in well-watered coco coir are usually white, healthy, and vigorous, growing continuously thanks to this optimal oxygenation.

Another important feature is that The coconut behaves like a sponge.It retains a lot of available water but drains excess easily. This allows for frequent watering without waterlogging the substrate. In fact, in coco coir You shouldn't wait until the medium looks dry to water., as you would with the land.

This is irrigated with intention, frequency and strategyBy following a plan. If done correctly, you'll see remarkable vigor, faster growth, and explosive blooms compared to traditional methods.

For these reasons, a well-managed coconut cultivation can outperform in 20–25% yield of a crop grown in soil. And all of that using less substrate per square meter: in a 3-liter coconut pot you can obtain similar results to a 7-liter pot in soil.

This is because coconut, by allowing more irrigation and oxygen, maximizes the use of every liter of substrateIt is also the ideal medium if you plan to automate irrigation with drip systems, as it retains moisture well but drains excess water quickly.

Small pots and plant density in coco

One of the first questions when starting with coconut is: What size pot should I use and how many plants per light are recommended? Unlike soil, coconut is usually recommended smaller pots and fewer plants by area.

Why? Because in coconut We are interested in watering frequently and have total control over what happens in the substrate. A small pot (3–5 liters, for example) dries out faster and “forces” you to water more often, keeping the plant in a constant cycle of hydration and oxygenation. Since coco coir is an inert medium, All What the plant receives comes from irrigation.

With a smaller volume of substrate, you can adjust nutrition more quickly (because any change in watering affects the entire medium), and avoid unwanted salt buildup.

The result: healthier, more efficient roots that respond better to fertilization adjustments. In short, Small pot = more oxygenated roots, more frequent watering = more vigorous plant.

On the other hand, having fewer plants per light (per square meter) This allows you to dedicate more space, light, and attention to each individual plant. Many plants crowded together compete for resources and tend to grow more slowly, produce less, and drink less per plant due to the competition.

In contrast, a few well-cared-for plants can fill all the available space with large, productive canopies. Production is measured by the space occupied, not by the number of pots..

You can achieve the same (or greater) harvest with 4 large plants as with, say, 9 small, overcrowded plants. The important thing is make good use of the growing area with healthy and balanced plants, without shaded or stagnant areas.

• Although at first it seems that more plants should mean more production, in practice this is not the case.
• With 9 robust plants in 4-5L I get more balanced and heavier harvests.
• If I put in 16 or 25, the plants are so small that, although they add up to a lot, the yield per light is usually lower, since each plant yields much less.
• In other words: 9 well-developed plants produce more grams per plant and proportionally more grams per light than 16-25 in a small pot.
• Then the ideal configuration For cultivation in coconut coir, it is: 9 plants per m² in pots of 4-5L

Even techniques like selective defoliation are used to ensure each plant receives enough light and air, maximizes its photosynthesis, and develops thick buds from top to bottom.

Nota: The term “dryback” It's used a lot in coconut slang. It simply refers to the substrate drying process between waterings. Control the dryback How long the pot dries before watering again is crucial: it influences root oxygenation, nutrient absorption, and the overall health of the plant. We'll discuss this concept further in the watering strategies section.

Drainage and substrate balance (system Drain-to-Waste)

We move on to a technical pillar of irrigation in coco: drainWhen we talk about "drainage" in this context, we are referring to the percentage of the nutrient solution that runs out of the bottom of the pot with each watering (the runoff water). Growing in coco coir using the technique Drain-to-Waste (drain to waste) means Water until you always obtain 10–20% drainage and discard that surplus, instead of recirculating it.

Why is it so important? Because that drainage It removes accumulated salts and fertilizer residue, preventing it from remaining in the substrate. Furthermore, thanks to the drainage, we maintain a stable substrate. nutrient balance, EC and pH inside the coconut, ensuring that the roots are always in a fresh, clean, and well-oxygenated medium. In other words, Watering with drainage each time "resets" the substrate under ideal conditions, ready for the plant to continue eating without encountering excesses.

Benefits of drainage with each watering: The manual mentions several: maintaining the EC under control, avoid nutrient blockages due to accumulation (for example, excess calcium or salts that cause imbalances), eliminate the need for flush aggressive mid-cultivation, improve root oxygenation and achieve more consistent buds.

It even forgives small mistakes: a coconut coir watered with daily drainage tolerates a lapse in fertilizer dosage better, because you can correct the excess at the next watering. In short, Daily drainage is the "secret weapon" of coco coir cultivation. to have a balanced substrate and happy plants.

Now What happens if you don't drain? If you water coco coir without drainage (or with very little), the salts from the fertilizers will accumulate. The EC of the substrate will rise and rise, the pH may become unbalanced, and the roots will begin to suffer in a toxic environment.

The plant stops growing and the coconut turns into a “salt marsh” which suffocates the crop. Many mysterious problems (burned leaves, blockages, strange deficiencies) come from poor drainage. Conclusion: drain it is not optional in coconut; that's what makes coconut such a predictable and manageable medium when you follow the rules.

Tip: Never leave drained water in the saucer under the pot. If the pot is waterlogged with this wastewater, it will be reabsorbed by capillary action, and the plant will once again be drinking water laden with salts (the very thing we were trying to eliminate). Therefore, use elevated pots or empty the saucers after watering. The water drains away.

EC of the substrate and climate control (VPD)

Let's talk now about two important technical concepts: the EC and the VPD.

EC means Electrical conductivity It's basically a measure of the concentration of salts (nutrients) in the nutrient solution. It's measured in mS/cm (millisiems per centimeter). In coco coir, we'll be paying close attention to the EC of what we're watering. y of the EC of the drainage, as they are indicators of how much food the plant is receiving and whether anything is accumulating in the substrate.

The guide provides us with a Recommended EC practical table by phases of the crop. In summary, the suggested values ​​of EC and pH Ideal ones are:

Cultivation phase	Recommended EC	ideal pH
Rooted (Cutting)	0.4 – 0.6 mS/cm	5.5-5.8
Vegetative onset	0.8 – 1.2 mS/cm	5.8-6.0
Active growth	1.2 – 1.6 mS/cm	5.8-6.0
Pre-flowering (Stretch)	1.6 – 1.8 mS/cm	5.9-6.2
Mid-flowering	1.8 – 2.2 mS/cm	6.0-6.3
Final flowering	1.4 – 1.6 mS/cm	6.2-6.4
Final wash	< 0.4 mS/cm	6.0-6.5

(Note: “ideal pH” refers to the pH of the irrigation solution at each stage, adjusted to optimize nutrient absorption.) These figures are not absolute rules, but they serve as a guide. In fact, it is advised that If your grow room isn't perfectly optimized, use conservative EC values ​​(leaning towards the lower end of the range).Less is sometimes more, especially for novice growers: it's better to err on the side of underfeeding than overdoing it and burning the plants.

At this point you may have heard the myth of “Don’t go above 2.0 EC because you’ll ruin the plant”. It's true? Not quite. The guide debunks this myth by explaining that It is not the EC figure itself that damages the plant, but the root's inability to absorb properly in an environment oversaturated with salts..

In other words, a high EC accompanied by poor conditions (Low oxygen, poor drainage, stressed plant) can indeed cause blockages and toxicity. But If you control the climate (VPD) and drainage, you can work with higher ECs without any problems..

This is where the VPDThese initials stand for Vapor Pressure Deficit (in English Vapor Pressure Deficit). Simply put, the VPD relates temperature and relative humidity to tell us how “thirsty” is the air and how easily the plant can evaporate water from its leaves. A "correct" VPD indicates that the plant can transpire efficiently: it neither suffocates from excessive humidity nor dries out from overly dry air.

Why does this matter regarding EC? Because A plant that transpires well can take up more nutrients. (i.e., it tolerates a higher irrigation EC) without suffering stress. Conversely, if the VPD is inadequate (e.g., a very humid environment that limits transpiration), a high EC becomes dangerous because the plant cannot drink enough and salts accumulate in the root.

The guide cites interesting studies: Caplan et al. (2017) observed that, under controlled drainage and good oxygenation conditions, yields No. they fell but They increased slightly using ECs above 2.5 mS/cm in bloom.

In other words, with good management, more food can mean more productive plants. But, Stemeroff (2018) He noted that when the EC in the substrate exceeds 3.5–4.0 mS/cm continuously y There is no good drainage, the plants show wilting due to osmotic stress, root blockage and even necrosis in the leaves.

Moral: Yes, it is possible to work with high EC, but only if you master all the factors (very frequent irrigation with drainage, perfect VPD, etc.)If you don't have complete control of the environment, It's best to stay within the suggested ranges. from the table for each phase. You'll have a larger margin of error and avoid unpleasant surprises.

In the authors' words, EC is a precision toolIt's not simply a matter of "more fertilizer = more potency." You can achieve excellent harvests with moderate EC levels if you maintain stability and a smart strategy. And you can experiment with higher values. solo Once you fully understand what you're doing: frequent watering with drainage, strict climate control (ideal VPD), and close observation of your plants. Remember the saying: “More fertilizer doesn’t mean more production… it means more risk if you don’t know what you’re doing.”.

Golden rules for watering in coconut

Having reached this point, let's summarize the golden rules that every coco grower must follow without exception. Many have already been mentioned, but it's worth listing them clearly because they are “non-negotiable” To succeed in this field:

Basic irrigation strategy (1 irrigation per day)

With the basic rules clear, we can discuss specific irrigation strategies. basic strategy The recommended way to start with coconut is to establish a rhythm of one watering per day (daily fertigation) when the plant already has a good root system and is growing vigorously.

Why water once a day? Because, as we saw, ideally we want the coconut coir to dry to 60–70% moisture in about 24 hours. If we choose the right pot for the plant size, this will happen: we water, the plant absorbs the water during the day, and by the next morning the coconut coir has lost 30–40% of its moisture, a sign that it's time to water again. This creates a stable 24-hour cycle, easy to follow and that provides both constant nutrition and oxygenation.

How to implement 1 daily watering? The most practical thing is Schedule the watering to take place approximately 1 hour after the lights come on. (If you're growing indoors). That's the moment the plant "wakes up" and activates its metabolism, so it will be ready to absorb water and nutrients. By watering at that time, you're giving the plant the energy it needs for the entire light period.

• Irrigation volume: You need to calculate how much time or flow rate you need to achieve that 15–20% drainage with each daily watering. For example, if you get that drainage with 1 liter per plant, that's your dose. If you get less than 10%, increase the volume slightly; if you get much more than 20% drainage, you can reduce it slightly (although it's always better to err on the side of caution).
• Adjustments based on growth: As the plant grows, or if you see that there is still a lot of moisture after 24 hours, you should adjust. In early vegetative stageSometimes the plant is so small that it doesn't dry the coconut in a day. In those cases, It is not necessary to water daily at the beginningYou can space out watering to every 2 or 3 days until the plant has more roots and is consuming more water. But in bloomWater demand rises significantly, so make sure you Water daily when flowering begins And gradually increase the volume or flow rate of irrigation as the buds fatten up (the plants drink faster). Always maintain that target of 10–20% drainage with each watering.
• Consistency: Water every day at approximately the same time to create a routine. Plants get used to and respond well to regularity.

This simple strategy of watering once a day with drainage has proven to be very effective. In fact, scientific studies support its effectiveness: for example, Caplan et al. (2017) found that daily watering with controlled drainage in substrates such as coco coir It produces greater dry weight of flowers and better nutrient absorption. than sporadic or poorly calculated risks.

It's no coincidence that this is the standard technique in many professional cannabis farms in Canada, the US, and Europe (when they don't use advanced sensor systems). Its strength lies in the reliability, repeatability and efficiencyIt is easy to implement and gives consistent results.

And if you have an automated system (e.g., an irrigation controller like Hydra), even better: you can program it to water every day at the indicated time, with the exact volume, without variations or omissions.

However, there may come a point where you want to squeeze even more potential out of the coconut. Is it possible to go beyond one watering per day? Yes. A natural evolution of this strategy is to move to multiple daily waterings (multifeedFor example, you could water two or three times a day during flowering.

What does this achieve? Basically, it keeps the substrate in an even more optimal state at all times: you don't allow the moisture to drop as much between waterings, the EC in the substrate remains more stable, and the plant never goes "thirsty" during the photoperiod. The guide suggests that, if you're looking for maximum vigor, you can Use a smaller pot and add extra watering whenever the coco coir drops to ~60–70% humidity (instead of waiting until the next day).

This makes the moisture pattern in the pot a more consistent curve, with smaller "teeth" (smaller rises and falls) instead of a large daily peak and valley. With multiple waterings, You improve substrate stability and reduce EC accumulation. and you significantly increase yield. In other words, it's taking coco coir to "pure hydroponics" mode, where the plant always has abundant nutrients and water, and the substrate never deviates far from optimal levels.

Example: Imagine watering three times a day during peak bloom: morning, midday, and evening. Each watering should be shorter, with 10% drainage. The plant never dries out completely, always having access to fresh nutrient solution. This can boost its metabolism—but be careful, it also increases water and fertilizer consumption, requiring careful monitoring to avoid constant overwatering. If you decide to try it, do so gradually, observing your plants' response.

Advanced strategy: Tesla method (simplified crop steering)

After mastering the basic strategy, the guide introduces us to a more advanced technique called Tesla strategy, which is basically a crop steering simplified applied to coconut.

Crop steering It means “directing the cultivation” by adjusting the environment and irrigation to guide the plant towards more vegetative growth (structure, leaves, roots) or more generative growth (flowering, buds) as we see fit.

In other words, we use the variables under our control (mainly how much, when, and with what we water, in addition to temperature/humidity) to “giving signals” to the plant and that it focuses its energy on growing or flourishing.

La Tesla strategy The method described in the guide is the one the author (Tesla1200W) uses in his Hydra system cultivation. It focuses on adjusting irrigation at different stages of the cycle to achieve specific physiological goals in the plant.

Instead of watering the same way from beginning to end, We change the frequency, drainage percentage, and EC according to the stage (vegetative vs. different flowering stages)This causes mild controlled stress or relief that influence the plant's hormones, maximizing both growth and the production of flowers and resin. Let's look at the key principles:

Phase	Estimated duration (Weeks)	Type of stimulus (Steering)	Parameters	Physiological objective
Vegetative (veg)	2–4	Vegetative stimulus	Drainage 15–20% P2: Coconut moisture 80% EC: 2.0 P3: 25%	Larger plants More sheets Root development
Early flowering	3	Generative stimulus	Drainage 5–10% P2: Coconut moisture 60% EC: 2.4 P3: 50%	Greater number of flowering sites
Mid-flowering	3–5	Vegetative stimulus	Drainage 15–20% P2: Coconut moisture 80% EC: 2.0 P3: 30–40%	bigger flowers
Final flowering	2	Generative stimulus	Drainage 15–20% P2: Coconut moisture 80% EC: 1.8	Final ripening of the flowers

P2: New maintenance irrigation event. – P3: Nighttime drying.

In summary, the advanced strategy involves “to balance” vegetative and generative periods during the cycle through irrigation. It's not simply about watering more or less, it's Knowing WHEN to water more gently or more vigorously to get the desired result.

It's like telling the plant at certain times, "Relax, grow and get big" (with plenty of easy watering), and at other times, "Hey, start flowering now" (with more restricted and concentrated watering). This controlled back and forth maximizes yield. In fact, many know it as crop steering techniques used in commercial crops, adapted here to a simple home growing environment (without the need for sophisticated sensors, just managing irrigation times and volumes).

Important: This strategy requires a good understanding of your crop. It is not mandatory for successBut it's interesting to understand. If you're a complete beginner, first master the basic strategy of one watering per day before attempting these advanced adjustments. Once you have some experience, you can gradually try some of these ideas (for example, allowing a little more drying time at the start of flowering, or adding an extra watering at some point) and observe the results.

Management of the initial phases: seeds, cuttings and phenohunts

So far we've talked about plants already established in the growth or flowering phase, but what happens in the initial phases of the crop (seedbeds, newly rooted clones, transplants) and in special scenarios such as phenohunts (growing many plants from seed to select phenotypes)? This section summarizes the guide's recommendations for those crucial first steps.

Initial watering after planting a seed or cutting: When we put a germinated seed or a cutting in coconut, It is advisable to thoroughly soak the entire substrate with good watering until drainage. since the first day.

It may seem counterintuitive (isn't that too much water for such a small plant?), but there's a technical reason: We need the entire volume of coco coir to be uniformly moist, with the same EC and pH throughout..

If we only water a little around the seedling, parts of the pot will remain dry and the roots will tend not to grow towards them. Even worse, salts could accumulate in these dry areas, creating pockets of substrate with different pH or EC levels that will later damage the roots upon contact.

Therefore, that first generous watering lays the foundation for a substrate homogeneous and stable so that the roots can spread freely throughout the pot.

What benefits do we get from watering to drainage in the initial stages? The guide summarizes them well:

• Uniformity in the root zone: The entire substrate is accessible and the roots grow in all directions without encountering dry areas.
• EC and pH balance from day 1: The plant does not suffer ups and downs or "surprises" of nutrients being present on one side but not on the other.
• Good oxygenation: Although it may sound contradictory, watering coconuts thoroughly doesn't deplete oxygen because moist coconuts still retain air (remember their porosity). So, that initial watering doesn't drown them; on the contrary, it delivers water and oxygen throughout the coconut.
• Water security: It's true that after that initial watering, the coconut coir might take several days to dry (since the seedling is low-water). But this It's not dangerous Provided the environment is well-ventilated and has adequate VPD (Variable Pressure Distribution). Coco coir retains air even when wet, so the roots will be fine. In these first few days, the frequency of watering isn't as important as establishing a stable and healthy base for the roots.

After the first thorough watering, monitor the moisture. For very young seedlings, you can wait perhaps 2, 3, or more days until the top layer feels dry. It's best to wait this long. err on the side of under-watering rather than over-watering at this stage After the initial watering: the plant still has short roots and consumes little water, so it's normal for it to take a while to dry. Don't water again until you see that the coco coir has lost a significant amount of moisture (not necessarily completely dry, but at least the top should no longer be soaked).

Choosing the initial pot – smaller is better: For seeds or newly rooted cuttings, the guide recommends using small pots to start with (0,3 to 1 liter)Why not plant the cutting directly in its final large pot?

Because in the early stages the root system is very limited and the plant cannot absorb water from a large volume of coco coir. If you put it in, say, 11 liters of coco coir from the start, when you water it you'll have 11 liters of soaked substrate that It will remain damp for many days. (since the plant drinks very little).

That prolonged excess of humidity in areas where there are no roots yet This can lead to oxygen deprivation, increased risk of rot and fungal growth, and generally stunted growth. Furthermore, if you have to wait a week to water again (because it's still wet), you lose the advantage of coco coir's constant nutrient supply.

In contrast, a small pot keeps the substrate “active”It gets thoroughly wet and then dries in a few days, allowing for more dynamic and frequent watering cycles, according to the size of the plant. The roots quickly colonize that small volume. Once you see roots coming out of the holes or filling the entire pot, you do the transplant to a larger pot.

When you transplant, your plant will already have a solid root base and be ready to immediately take advantage of the new substrate. In short, Starting small does not limit growth; on the contrary, it facilitates controlled and healthy root development From the very beginning. This advice is invaluable for both normal and non-normal cultivation. phenohunts, where you handle many seedlings at once.

Tips to phenohunters: If you're going to germinate a lot of seeds to select phenotypes, using small pots is almost mandatory for logistical reasons. You could have, for example, 20 seedlings in 0.5 L pots under a light. Water them all until drainage at the beginning for uniformity.

Then, as they grow, you'll need to water them more frequently (these small pots dry out quickly). Keep an eye on each individual plant; at this stage, you'll likely be watering by hand because each plant may dry out at a different rate. Once you've identified the desired phenotypes to continue growing, transplant them into larger pots for flowering and discard the others.

Do not overfeed at this stageWe keep the EC low (0.5–0.8) until we see good growth, and then gradually increase it. Keep in mind that in small pots, EC errors become apparent quickly, so it's best to proceed with caution.

Root washing (flushing) in coconut

We have reached the final stage of the cycle: the root washing o flushingIn cultivation using mineral nutrients, it is common practice to "flush" the substrate at the end of flowering to remove excess salts before harvest, in order to improve the flavor and quality of the buds. However, Flushing in coco coir has its own particularities.

Common mistake: Many people think that washing is simply watering with plain water for a few days and that's it. Beware! In coco coir, watering only with water (zero nutrients) can be counterproductive.

Let's remember: coconut is an inert medium but with cation exchange capacityThis means it retains certain ions (mainly Ca²⁺, Mg²⁺, and K⁺) attached to its fibers. If we suddenly start using only reverse osmosis or very soft water without nutrients, the coconut releases those retained cations all at once It also absorbs other components from the solution, throwing everything off balance. The result is that the substrate loses its equilibrium and the plant suffers osmotic shock.

The guide explains it this way: watering only with water in coco coir causes pH imbalances, osmotic stress (the plant cannot absorb nutrients properly because the concentration outside and inside the root zone becomes unbalanced), death of fine roots, and uncontrolled self-destruction (autophagy) of the plant. In other words, a flush with pure water can to kill with hunger and thirst to the plant ahead of time, ruining the final stretch.

So what does a proper coconut washing entail? The guide recommends do not use only waterbut a nutritious solution very light and fittedIn other words, continue feeding the plant but with very low doses, just enough to avoid serious deficiencies while the reserves are being used up. Specifically, the following is suggested:

• Prepare a solution with EC around the 20–25% of the EC you used during full bloomExample: if you were fertilizing at 2.0, you would do the flush with EC ~0.4–0.5.
• Adjust the pH between 5.9 – 6.1 (a slightly acidic neutral pH so that it doesn't dissolve too many coconut salts).
• Include a little bit of that lightweight solution Ca and Mgand a base of micronutrients. Many fertilizer lines have specific flushing or finishing products with that idea: basically removing nitrogen and other nutrients, but providing calcium/magnesium and trace elements so that the plant doesn't collapse before harvest.

The step-by-step procedure would be:

1. Prepare the light solution with EC and pH indicated.
2. Water abundantly Use this solution until you achieve good drainage with each watering. Here we do want to flush the substrate, so we can use a little extra water to thoroughly rinse it.
3. Repeat this light watering each time during the flushing daysNot just once. For example, during the last 7–10 days of flowering, water daily (or as needed) with the low EC solution.
4. Measure the EC of the drainageYou'll see that day by day it will decrease, approaching the EC of the flushing solution. This is a sign that the accumulated salts are being eliminated. If you start with very high drainage levels (for example, 3.0) and your solution is 0.5, after several days the drainage might be around 0.7–0.8, a sign that the coco coir is almost "clean."
5. Keep the coco moist throughout the flushDon't let the soil dry out completely between waterings, because the plant could suffer then (remember that it's currently on limited nutrients, don't stress it further with drought). We want a gradual decrease in nutrients, not a sudden shock.

Benefits of this controlled washing method: The guide highlights that this is how we achieve a progressive cleansing of salts. without osmotic shockpreserving root activity until harvest time. The plant consumes its nutrient reserves gradually. natural (controlled autophagy), slowly yellowing just enough, which It improves flavor and combustion quality. of the final product (less excess nutrients in the tissues means weed that burns better and tastes smoother). Furthermore, we avoid seeing completely dead or crunchy plants before harvest; with this method, the leaves may turn yellow but remain functional, photosynthesizing until the very end and fattening the buds until the last day. It's a balance: you clean the substrate but keep the plant alive and active in the final stages.

In practice, how long does the flush last? It depends on the strain, variety, and how heavily you fertilized. In coco coir, thanks to continuous drainage, it often takes longer. 7-10 days This light flush is sufficient. Some growers do 14 days if they were aiming for very high-quality buds and fertilized heavily beforehand. Observe the plants: when you see the large leaves gradually yellowing and the buds have matured, you're close to the optimal point.

Scientific appendix: Why does controlled irrigation work?

For the curious, the guide includes a science section explaining why All these irrigation techniques work, from a plant physiology perspective. Let's summarize some interesting findings that support this method of growing in coco coir:

• Moderate water stress increases cannabinoids: A study by Caplan et al. (2019, Univ. Guelph) found that applying controlled water stress in early bloom (allowing the substrate to dry to 60–70% before watering again) caused a significant buildup of abscisic acid (ABA) in the plant and redirected more carbohydrates towards secondary metabolites, resulting in increased cannabinoid production without reducing biomass Harvested. In simpler terms: letting the plant "go a little thirsty" at the start of flowering activates a hormonal signal that increases potency (resin) without reducing the size of the harvest. Exactly what we were aiming for with generative irrigation!
• ABA, the drought hormone: What is ABA? It is the stoma closure hormone and response to water stress. A review by Sharma et al. (2025) explains that abscisic acid produced in roots and leaves when water is scarce causes the plant to close stomata (to prevent further water loss), activate defense genes, and moderate growth, focusing on survival. In our context, a small amount of ABA induced at early flowering not only manages stress but also It indirectly stimulates flowering and resin production.In other words, giving the plant a mini scare of "drought is coming" makes it flower more eagerly and accumulate more resin as a defense.
• Ethylene and generative maturation: In addition to ABA, the signal of controlled drought activates the production of ethylene, another hormone associated with maturation. According to educational sources (Alchimiaweb cited in the guide), ethylene under water stress accelerates processes such as leaf senescence (aging leaves), stem lignification, and volatile terpene productionIn other species, this is well-documented, and in cannabis, ethylene is observed to accompany ABA in these cases, aiding the transition to flowering and enhancing aromas. This supports why this slight stress towards the end of flowering is also beneficial: more aromas, autumnal colors in the leaves (lignification), and a signal that the plant is "finishing its cycle."
• High EC levels during flowering can enhance buds: Another recent study (Lucchetta et al., 2025, Univ. of Bologna) cited suggests that using a higher EC during flowering, combined with less frequent drainage (that is, retaining more nutrients in the coconut) resulted in greater floral density and cannabinoid accumulation, as long as The water balance will be properly controlled. This aligns with our approach: in early generative growth, we increase EC and reduce drainage to promote a higher concentration of nutrients in the substrate, but at the same time, we do so with controlled drying (water balance), and then compensate in mid-flowering by increasing drainage again. The result: denser, more resinous buds. However, you have to "play with fire" – doing so without VPD control or without subsequently balancing it could burn the plants, as we saw in the EC section.

In summary, science supports the idea that Strategically managed irrigation manipulates the plant's internal signals To improve the final result, a little "good stress" (moderate drought, slightly high EC at specific times) activates natural responses (defense hormones) that increase cannabinoids and terpenes. And keeping the roots happy (oxygen, some nutrients even during flushing) ensures that the plant can take advantage of every last moment to produce.

Summary of the main concepts for coconut cultivation

Coconut substrate is a inert medium and of the hydroponic type that requires frequent watering with a nutrient solutionSince it does not provide nutrients on its own, its excellent aeration makes it difficult to overwater, which promotes root development and more vigorous growth than in soil.

Regarding the use of potsIt is recommended to opt for small sizes from among 3 and 5 liters For better irrigation control and root development, it is preferable to work with fewer plants but better distributed. seeds or cuttingsIt should begin in very small pots of between 0,3 and 1 liter to facilitate rooting.

An effective irrigation strategy involves carrying out frequent and well-planned irrigationAlways ensuring drainage of 10 to 20% of the irrigated volume. This is essential. adjust both EC (electrical conductivity) and pH at each stage of cultivation. Ideally, irrigation should be automated to ensure the regularity and precision of the process.

With regard to the drainage and nutritionNever water with just water, as coco coir needs nutrients with every watering. Any excess water must be drained to prevent salt buildup, so the growing system must be designed to function as a “Drain to WasteFurthermore, it is important to regularly review the EC of the drainage and prevent the pots stay flooded.

At the end of the cycle, a substrate washing Use a low-concentration nutrient solution, never pure water. This helps eliminate accumulated salts and improves the flavor of the final product. Drainage must be maintained even at this stage.

Amongst the most common mistakes These include not allowing drainage after watering, which leads to salt accumulation; leaving pots resting on their own drainage, which prevents proper drainage; watering manually and without consistency; and using untreated tap water without measuring its composition.

In short, coconut cultivation allows total control over the root environment conditions, but it requires consistency in irrigation, drainage and fertilizationThe greater the oxygenation in the root, the greater the production.

We hope this guide becomes your travel companion and a clear reference throughout your coco coir growing adventure. As Tesla and Nabis explain, “Our goal is for you to understand each phase and each cycle of cultivation, because coco offers enormous advantages when you know how to interpret the signals from your plants and maintain good control of irrigation and nutrition.”With attention, observation, and consistency, you will discover the full potential of this substrate. We wish you a successful grow, with vigorous plants and roots that are always white, healthy, and full of life.