How to grow cannabis with Coco Coir

There are more ways to grow marijuana than simply putting the seeds in soil.

One grow medium that has a lot of benefits is called Coco Coir.

Not only will you be able to re-use your medium, but you may also get a heavier yield from using this product instead of soil. Find out how!

What is Coco Coir?

Coco Coir otherwise known as coco, cocopeat or coir peat is created by grinding up the seed husk of coconuts.

The husk tissue is biodegradable, and a renewable resource that can be used to grow cannabis and coco can be used up to three times before you retire it.

Super cost-effective, environmentally friendly and would you believe one of the best substrates for growing big healthy cannabis plants.

Download my free marijuana grow bible to learn more about growing cannabis using Coco coir and other growing substrates.

Why Coco Coir for cannabis?

Every year more than 3 billion coconuts are harvested and processed in countries like Sri Lanka, India, and the Philippines.

The fiber that holds the actual coconut shell is used in many products such as insulation, ropes and now a growing medium.

A marijuana plant growing in coco coir
A cannabis plant in coco coir

Coco Coir is made from the coconut tissue called mesocarp, and it acts and feels a lot like soil when it’s ground up finely.

While Coco does share some similarities with soil, there are some major differences.

Types of Coco Coir

When considering Coco as a growing substrate, there are 3 main types of processed Coco you can choose from – fiber, pith or chips.

Which is best for growing cannabis? I believe that Pith is the best growing option for cannabis because of its soil-like texture.

Pith is very similar in texture to peat moss but had a rich brown color.

Its light density which increases the surface area in the substrate allows for better oxygenation of the roots while retaining water safely in the root area.

Just mix about 15 to 20% Perlite into the mix to supercharge your grow.

Coco Coir for growing cannabis plants
Coco Coir

Coco fiber has a stringy texture to them which allows oxygen to enter your root zone.

Mixed with some Coco Pith to increase water absorption.

Coco Chips are small chunks of Coco that also create large air zones in your roots.

The size of the substrate bundles makes this Coir not suitable for growing cannabis in my opinion.

An experienced and knowledgeable grower will use a mixture of soils and substrates to develop their own perfect formula for growing cannabis.

There are pre-mixed products that take care of the work for you.

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Coco Coir vs Soil

The first difference is how Coco Coir acts as a moisture sponge holding an incredible amount of water/nutrients while still providing more airflow to the roots of your plants than could ever be achieved with soil. (If you only want to use soil as a medium, then read our guide on the best soil to grow marijuana.)

The amount of surface area the coco provides allows for lots of oxygen to be trapped beside the root formation.

Coco is an inert medium that carries little nutritional value to your plants just some natural potassium (K) and phosphorus(P).

Even more interesting is the fact that as substrate, coco has a pH in the 5.6 to 6.2 range which is perfect for cannabis.

Since the medium carries no nutrients on its nutritional supplements are needed to sustain your plant.

The woody-like structure of Coco is comprised of two-thirds carbohydrates and one-third lignin.

The complex carbohydrates are polysaccharides cellulose and hemicellulose.

Coco Coir vs soil for growing marijuana
Coco Coir is different from soil in many ways

I know it’s a mouth full, what’s important is that these tiny structures are the perfect breeding ground for beneficial micro-organisms.

These microcosms are the lifeblood of your root zone and also include helpful bacteria known as rhizobacteria.

Oxygen, water and nutrients power this little world but the conversion of these elements into useful plant food takes place because of the micro-universe of bacteria and micro-organisms that break down the cellulose in the coco fibers which is converted into carbon which feeds microorganisms and the plants.

If you feel the Coco in your hands, you’ll notice right away how light it is compared to regular potting soil which is much denser.

The Coco is light and almost fluffy in a sense because the material has so much surface area.

In contrast, potting soil is dense and clumps together which provides a little area for oxygen at the root level.

More oxygen in your root area is going to grow your plants faster and healthier.

There is a second benefit to Coco, and that is its ability to hold water while still providing room for oxygen. This is a major limitation of regular soil.

Nutrients for Coco Coir growing

Coco can’t support your plant’s full growth cycle without support. You need to select a nutrient option that is safe for growing in Coco.

Since this substrate contains significant amounts of potassium and phosphorus plus trace amounts of nitrogen, calcium, magnesium, boron, chlorine, copper, iron, manganese, molybdenum and zinc you’ll need to use an appropriate nutrient formula to fill in the missing components.

Nutrients For Coco Coir Growing Cannabis
Must use nutrients with Coco Coir

I’ve done a lot of research on nutrients for Coco and have read two schools of thought.

The first is that you need to consider that the Coco contains significant amounts of potassium and phosphorus, so your supplemental nutrients should have less base potassium and phosphorus values. Coco also requires additional nitrogen to support the micro-organisms in your root zone.

Make sure you buy quality Coco coir because it can contain high amounts of sodium and chlorine which will not be healthy for your plants.

A quality provider washes and leaches out these unwanted elements which occur naturally in Coco because coconuts grow near the ocean.

Coco Coir: renewable and re-usable

Coir that has been used in up to 3 grows can be flushed clean and then used for your next grow.

After three uses the Coir starts to break down and makes it unsuitable for growing.

Coco Coir is a Re-Usable for growing cannabis
Coco Coir is a re-usable and renewable resource

Coir is a completely renewable resource; each coconut tree produces 150 coconuts per year.

If you use peat instead which has its growing issues and requirements, you are using a resource that is estimated to take 25 years to create in a peat bog.

Coco Coir and pests

Coco Coir does not attract most of the garden variety of insects and pests most of the time. Grows in Coir should give you an extra safety net with fewer issues to worry about.

Bigger yields with coco coir?

Cannabis plants truly love Coco and respond very well by showing increased growth and size of both the plant and buds.

Switching your grow to Coco isn’t going to give you hydroponic type gains but you will see significant improvements in your cannabis grown in Coco when compared to standard soil or peat.

Coco is easier to deal with than soil by far. Having the extra oxygen in the roots while maintaining good moisture levels makes watering a breeze.

Coco Coir is a hybrid between soil growing and hydro growing. Its natural fibers make it more forgiving than full hydro systems and much more responsive to nutrient changes than soil.

Plants will grow bigger, faster and yield up to 25% more than soil-grown cannabis.

Growing marijuana in coco coir can lead to bigger yields
Growing marijuana in Coco Coir can lead to bigger yields

I know what you’re thinking; can I back up that faster bigger growing claim with any proof?

Well, I sure can! When I was asked to write about growing in Coco Coir, I set out immediately to start a grow of premium OG Kush in Coco Coir using a 1000 W compatible Wide-Band Led Grow light.

The difference was noticeable almost immediately. Within a week I could see that my seedlings had matured much more in Coco then if it had been planted in soil.

The plants looked strong and healthy from start to finish.

I previously grew the same OG Kush in soil and created side-by-side photos showing the plants at the same times.

You’ll notice the Coco plant is bigger right away when compared to the potting soil option.

With all its benefits, using coco coir to grow marijuana is definitely worth a try. Make sure you buy high-quality weed seeds from ILGM shop to pair it with!

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Around week 4 of Vegetation, I began having issues with the plants having nutrient deficiencies.

It first showed up as marks on the top of the leaves.

Not only is Coco Coir more productive than soil, but it’s also eco-friendly, versatile and easier to use.

Coco can be purchased in several formats such as pellets, bricks, sheets or ready-to-use bags which I prefer. You can find Coco at any growing store or where I like to buy it is on Amazon.

By Bud Durden

FAQs about Coco Coir

Does Coco Coir go bad?

While the base itself does not really go bad, it may contain additives that degrade over time. Peat moss typically has a recommended shelf life of six to 12 months.

Can you overwater Coco Coir?

Compared to regular soil, Coco Coir is more forgiving in terms of overwatering, especially for beginners.

What is the pH of Coco Coir?

The pH range for Coco Coir ranges between 6.5 to 7 pH.

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13 comments on “How to grow cannabis with Coco Coir”

  1. I’m trying to find info on two different styles of coco growing Is there a significant difference between amended coco coir making a living soil or the regular using hydroponic nutrients? Yields? Growth rates? Pests?

  2. I bought super soil autoflower concentrate and am looking to use it in a coco and perlite mix is this a mistake or am I on thee right track

  3. Hey you need more on the nutrients section! You’re like “two schools of thought one that says blah blah” Then you just totally move on. You dont talk about what nuts might be good for school of thought a, or even mention what school of thought b was!

  4. ‘@marcus Have you joined the forum? Lots of fellow growers there that will eagerly help you. also, you will need to give a little more info such as growing medium, lighting, etc. good luck and happy growing!

  5. I can get my seeds to the point where they’re about a 2-inch sprout and then that’s it I can’t get them to grow any fatter or taller. Help?

    • put tap root down in coco coir add sensi grow advance nutes there ph correct use good drain pots and drain catch and let it feel good and damp let grow water with nutes direction on bottles 2 times or when coco looks dry thet will grow fast led grow light 14 inches from pots and 68 to 70 perfect temp make sure nice air room or use little fan or nice put outside sun is best light. happy growing fastlane 63 .