Growing weed in coco coir is a great way to to produce high quality marijuana for new and experienced growers alike. In this article we’ll teach you everything you need to know to grow weed in coco, including a list of materials you’ll need, nutrients, and a how-to guide for growing marijuana plants in coco that will yield very impressive results every time.
Materials needed to grow coco coir
In it’s simplest form, to grow weed plants in coco you’ll need to purchase the following materials. This list includes the coco coir medium and containers, amendments to improve aeration and drainage, and supplemental materials used in the growing process.
- Quality coco coir medium (premixed bags are simplest, coco bricks are more economical)
- Perlite (increases drainage which is good for strong roots)
- Rinsed gravel or marble rocks, clay pellets, etc. in bottom of container to facilitate drainage (optional)
- Plastic saucers or other container to catch watering runoff
- Cloth grow bags, plastic grow bags, air pots, nursery pots, or even a 5 gallon bucket with drain holes will work
- 5 gallon bucket (to mix nutrient solution)
- Stirrer (large plastic spoon, etc.)
- Digital pH meter such as Bluelab or Hanna (required to ensure proper acidity level of nutrient solution)
- Ph down (to get nutrient solution to necessary Ph range of 5.8-6.0)
- Ph up (in case you overdo the Ph down)
- Small shop vac (helpful to suck up watering runoff, and also to dry-vac to keep a clean grow area to reduce pests)
More experienced coco growers may invest in additional nice-to-haves like automatic watering timers and drip systems to reduce the amount of day-to-day work to maintain your plants. Make no mistake, growing weed takes a lot of effort. But it’s also extremely rewarding. And getting down to manually water your plants is especially good for newer growers as you’ll be able to more easily spot insect issues, nutrient deficiences, mold formation, or other problem signs.
The best nutrients for coco coir
The best nutrients for growing weed in coco coir are made for growing weed in this medium. But realistically use any hydroponic nutrient line. It’s not a bad idea to try a few to see what gets you the best results for the lowest price, as nutrients can get expensive. Most nutrients for growing in coco are chemical, but there are some organic or veganic options for cannabis available as well.
Make sure to run the proper pH level for coco as well as maintaining the optimal PPMs for coco to avoid nutrient burn. Getting an electronic pH meter is a must, you’ll use it every time. You could opt for the drop test pH kits if money is a concern, but the pain in the butt factor makes the electronic pH meter pretty much a requirement.
Canna Coco nutrients are a proven method for growing marijuana in coco and consistently yields good results. Canna Coco’s nutrient line consists of Canna A & B (the main nutrient source) along with Rhizotonic (rooting supplement), CannaZyme (enzymes to boost plant health in coco) CannaBoost (flowering enhancer), and PK 12/13 (phosphorous and potassium booster during flowering).
When running Canna Coco you’ll also likely need a calcium and magnesium supplement such as Botanicare Calmag Plus or CaliMagic, Fox Farm Gringo Rasta Cal-mag or Bloom City Cal-mag when growing marijuana in coco. You can get the best prices on Canna nutrients by ordering from Amazon, and some local hydro shops near me will match whatever the current lowest Amazon price is which is cool.
General Hydroponics nutrient trio is a 3-part nutrient line that is suitable for growing weed in coco coir. General Hydroponics Flora Grow, Flora Bloom, and Flora Micro are cheaper to run then the Canna line and tons of growers swear by GH. They come in some combo packs.
Don’t forget your CalMag supplement, Calmag Plus or the GH CaliMagic combo, or else you will likely see Ca and Mg deficiencies.
Fox Farms Nutrient Trio
The Fox Farms nutrient trio consists of Grow Big, Tiger Bloom, and Big Bloom. Grow Big is used in the vegetative growth stage, replaced by Tiger Bloom once you see the first signs of bud development, generally a week or two after flipping lights to 12-12. Big Bloom is used throughout both growing cycles.
Fox Farms makes a number of other products to enhance their basic trio (such as the dirty dozen starter pack), but if you’re just starting out you can begin with the trio and still see great results.
House and Garden Nutrients
Whether your results are worth the added cost isn’t something we can answer since we’ve never run this line. But if cost isn’t an option this line will get you some nice buds for sure. As always, invest in a cal-mag supplement as well.
The Vegamatrix nutrient line consists of veganic nutrients that can be used with coco coir. Veganic weed growing takes organic growing to the next level, using only non-animal sourced organic ingredients. It was started by Kyle Kushman, a former High Times editor, breeder, and skilled grower.
The Vegamatrix nutrient line consists of Grow, Bloom, Boost, Prime Zyme, Hard-n-Quick, FTB, Amp-it, and Big-n-sticky. Multiple Cannabis Cup winners have used the Vegamatrix line. There’s a lot more bottles to consider with this line, but it’s the only veganic nutrient for coco coir that we’re aware of so if you feel you need to ditch the chemical nutes to get the best tasting weed then go for it.
DynaGro nutrients consists of Foliage Pro and Bloom. I’ve never used it, I tend to lean towards one of the more coco-specific options. But some growers we’ve spoken to have run DynaGro with suffiecient results.
Make sure to mind your calcium and magnesium, as with any coco nutrient you’ll likely run into issues if you don’t use a cal-mag supplement.
Botanicare Coco Nutrients
Advantages of growing weed in coco coir
Coco offers the advantages of hydroponic growing: fast, vigorous root growth and plant development with precise control over nutrition.
Growing marijuana in coco coir is great for new growers since the coco medium holds water so it can be more forgiving than other hydroponic methods. It is resistant to insects or other pests and if watered correctly will resist mold and root rot.
How to water plants in coco coir
With coco you’ll water plants until 15-20% runoff occurs. This provides fresh nutrients and oxygen, with the runoff removing any nutrient salts that may build up in the medium. Coco can be watered by hand, or by connecting an extendable watering wand with a small pump. Never let the plants sit in the runoff, use a small shopvac to suck it up or you can set up a drainage table to draw away the excess solution.
Coco can be used throughout the entire grow process, from seed planting or clone rooting and for transplanting during vegetation, straight through the final flush at the end of flowing. Make sure to maintain proper nutrient levels depending upon the stage of growth, you need stronger nutrients during mid to late flower. More on that below.
And make sure to maintain the proper ph for growing weed in coco, around 5.8–6.0 range. Use a Ph meter. Don’t guess at it. Marijuana needs a slightly acidic medium in order to properly absorb nutrients, and improper Ph leads to the majority of issues that new growers face when using coco. I use Canna Coco and have had consistently good results, here’s more info on the best Ph for growing in coco, including how to lower Ph correctly and how to fix Ph issues in plants grown in coco.