Future Garden

The Benefits of Coco Coir

What is Coco Coir?

Coco Coir is a by-product of the coconut and is an organic, environmentally sustainable, hardy, inert substrate that is used as a medium to grow plants in.

Coco Coir is manufactured using fibres from coconut shells. To create it, coconuts are cured allowing the husk’s pulp to decompose. The coconut fibre is then removed from the shell. Once gathered the fibres are then dried and pressed or bagged loose ready for sale.

The higher quality brands of Coco Coir will triple wash, dry and buffer the fibre before pressing or bagging. Most Coco available on the horticultural market has been properly processed.

Benefits of using Coco Coir

Quicker growing and bigger yields: 

Coco allows plants to grow faster by providing a blank canvas so carefully tailored mineral based nutrients are directly available to be taken up by the plants roots. Thus, there is no waste and the plants you are feeding can be fed according to an exact range of nutrients and additives to get the maximum out of each crop.

Getting the best results is all about control and Coco Coir gives you just that. 

Plenty of room and air for the root system:

Coco Coir offers a great mix of water retention, reliable drainage and aeration. It gives the roots plenty of room, allowing for optimum air exposure. Pure coco gives plants the maximum space for roots as there is nothing that will hinder the path of their growth.

pH-neutral value: 

Good Coco Coir has a neutral pH range of 5.2–6.8, meaning it’s a blank canvas which allows you to add the exact nutrient requirements needed for your plants.

Minimises pathogens and the risk of pests

Coco has anti-fungal properties, which makes for healthier roots by protecting against infections such as Pythium and Phytophthora. Several common pests also avoid coming into contact with Coco Coir, reducing the likelihood of pest problems later on.

Environmentally conscious, recyclable product: 

A single coconut tree produces roughly 150 coconuts annually, so the manufacture of coir is sustainable. Coco Coir uses parts of the nut that would otherwise go to waste. Coco Coir can also be recycled as long as you prep it correctly.

Top tips for using Coco Coir.

Types of Coco

There are many “Coco” products available for various horticultural uses. Propagation and the germination of small seeds requires a very fine, dense grade of Coco, such as Coco pith which can hold a large amount of moisture as well as oxygen. General purpose Coco is made up of Coco pith, stringy fibres and larger pieces known as Coco chips, this is the most widely used form of Coco and is considered ideal for many plants. The coarser Coco particles (Coco fibres and chips) encourage aeration, whilst the finer, denser, Coco pith holds onto more moisture. A combination of the 2 is what makes Coco such an ideal environment for your plants to thrive.


Whilst there are some innovative and reliable brands of Coco on the market, there are also still many poor-quality brands out there that will not be up to scratch to get you the results you want. Poor quality Coco will not be “buffered”, “conditioned” or “pre-treated”. Poor Coco is often treated in sea water, leading to high levels of sodium chloride (salt) which can negatively impact on the growth of plants. Reputable horticultural brands use fresh water buffered Coco, like that found in the range of GrowDog substrates.


Coco Coir holds nutrients well and so you can take advantage of this and give your plants a strong start by pre-feeding your coco medium with nutrient solution before you start planting. Doing so will ensure there are nutrients stored ready for use as soon as you transplant or re-pot. To pre-soak your medium efficiently you should apply a ¾ strength feed to your Coco until you see the runoff from the bottom of your pots. When soaking compressed bales or b’ounce pots , leave the coco to stand in solution until the water is absorbed and the coco has fully expanded.

PH, EC and moisture levels.

To get the best from your plants you should regularly measure and monitor the pH and EC of your nutrient feed. pH is a measure of how acidic or alkaline your feed solution is and should ideally be between 5.5 and 6.5. Anything outside this range will mean some of the nutrients will be unavailable for your plants to take up. pH is they key that unlocks access to the nutrition

EC is a measure of how strong your feed is, the target for your EC will fluctuate depending on the plant you are growing, the stage of growing cycle and how hard your water is. For healthy root growth and good drainage, your Coco needs to have lots of air in it as well as being moist. If it becomes over saturated the Coco will become compacted, there won’t be enough air available in the medium and your plants will suffer.

As a general rule of thumb, to check the moisture level of your Coco, squeeze some in your hand. If the moisture disappears between your fingers then it is at the correct level, If water runs out of the Coco, it’s too wet and if no moisture appears at all, more watering is needed. 

Mixing Coco with Perlite, Vermiculite or Clay pebbles

Perlite, Vermiculite and/or Clay pebbles can be added to Coco to achieve optimum results.

Perlite is volcanic glass, heated until it transforms into a white mineral. Perlite can hold onto oxygen very easily, creating a highly aerated environment for roots to thrive.

Vermiculite is a mineral, which expands when exposed to high temperatures, allowing it to retain 300% of its weight in water. This makes it an ideal addition, especially when used in conjunction with Perlite, where the two will drastically enhance the oxygen and water retention in your Coco, as well as overcoming coco compaction over watering issues.

Clay pebbles are small pieces of clay that have been processed at extremely high temperatures. They are popular in hydroponic systems but work well with Coco too. They are light and porous and when mixed in to your coco, supply the plants with an abundance of oxygen for fast root growth, and enough moisture to provide healthy water and nutrient retention.

You can make up your own ratio of mixes or buy pre mixed products that have been carefully put together to meet the needs of most plants.

Watering and Irrigation

Coco has reliable water retention and drainage however good watering practices and efficient irrigation systems are still important in order to avoid substrate compaction, root drowning or dehydration!

Run off is the excess feed that runs out of your pots after watering.

You should aim to achieve a run off of 20-30% of each feed, if you want your roots to be taking up water and nutrients efficiently. If you are purely hand feeding be sure to remove any run off regularly so that it is not re-absorbed.

If you are using a system that doesn’t produce run-off then you will still need to prevent levels of nutrient build up in the Coco.

Nutrient Range

Coco Coir is a pH neutral inert substrate that does not contain the natural level of nutrients that soil does. It is important therefore to use a “Coco safe” mineral nutrient range.

Coco Coir naturally contains levels of both Calcium and Magnesium but in insufficient amounts to be able to feed your plants. Not only that, but calcium and magnesium are both naturally inclined to bind to the Coco Coir itself, leaving them only partially available for plant uptake.  A decent Coco nutrient range should therefore contain high quality, chelated forms of Magnesium and Calcium that will not “bind” to the Coco and instead be fully available for the roots. With this in mind you should also use a Coco suitable “Calmag” supplement alongside your regular Coco friendly A and B feeds. 


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