Ultimate Guide to Using Coconut Fiber for Plants in Hydroponics

Are you looking for the perfect growing medium for your plants? If so, you should consider switching to coconut fiber for plants — an incredibly versatile and sustainable hydroponic medium made from the husks of coconuts.

These brown fibers ensure maximum nutrient absorption and retention without drying out your plant’s roots.

By using this product, not only will your garden look great, but also it will be easy to clean and maintain. 

This long-lasting material is lightweight yet durable, has excellent moisture retention properties, offers superior aeration – making it easier for roots to penetrate the potting mix – and provides consistent pH levels, which promotes a vigorous root zone for your growing plants! 

Try some coconut coir for your plants today and get excellent results!

coconut shell

What Is Coconut Coir?

Coconut coir is the raw fiber found between the shell of a ripe coconut and its outer coating.

It has become increasingly popular for use in gardening and household products.

This material was once labeled as a ‘disposal product’ when coconuts were only harvested for their edible components.

Two distinct forms of fibers compose coir, depending on the maturity of the coconut from which it is sourced: brown and white.

Split into two fibers, brown coir is made from mature ripe coconuts, which create more robust, less flexible fibers, while white fibers come from pre-ripe coconuts, which are much more flexible but not as strong.

coconut fibers

Reasons You Need To Know For Using Coconut Fiber For Plants With Hydroponic Systems

Coconut coir stands out from other products due to its incredible water absorption capability, holding up to ten times its weight in water while maintaining space for oxygen flow. 

This makes coconut coir highly popular among plant owners looking for an excellent soil amendment that provides drainage and aeration without compromise. 

Hydroponic gardeners relish the advantages of using coir fiber as a support medium due to its sterile nature and capability to thwart fungal growth.

Coconut coir not only provides benefits in hydroponics but also offers other significant uses for gardening.


  • Highly absorbent and provides good aeration for plants.

  • Low in nutrients, reducing the risk of nutrient overload.

  • Lightweight and easy to move around.

  • With a pH level within the generally accepted range of 5.2 to 6.8, there is no need to be concerned about nutrient availability when using this product.

  • Inexpensive and widely available.
coconut coir product

Instructions for Preparing Your Coconut Coir

Using coco coir fiber is becoming increasingly popular among hydroponic gardeners.

This eco-friendly byproduct of coconut husks has several vital traits that make it a suitable choice for the successful growth of plants.

When considering coconut coir for a hydro system, buyers should:

  • First, pick from various coconut coir products, such as potting mix or compressed coconut coir bricks.

  • Second, buyers need to consider the pH levels in certified coco products, as fluctuations may lead to significant mineral availability problems throughout the system. This can impact root absorption rates and eventual plant yield and health.

Overall, coconut coir is an excellent material that allows users to experiment with different substances depending on their needs – but understanding its unique properties before constructing a hydroponic system is essential for reaping its fullest benefits!

Testing Coconut Coir For Hydroponic Use

Both pH and electrical conductivity (EC) in coco coir are critical factors for its proper use in hydroponic gardening.

Most coco coir for hydroponics on the market these days has been thoroughly washed and comes pH-neutral; however, testing the pH and EC in coco coir is a good idea before it is used as a growing medium.

Testing can be done with a simple pH meter or pH test kit. When used in hydroponics, the ideal range for coconut coir should be within 5.5-6.5pH and in the range of 0.8-1.5 EC.

Anything outside this range could affect the growth of your plants, and corrective measures should be taken before use.

bluelab combo meter
Bluelab Combo Meter

The safe bet is to go with a reputable brand that takes special care when preparing coco coir for hydroponic gardening.

Always select a low-salt content coconut coir to ensure the best quality for your hydroponic endeavors.

But more importantly, remember to flush it with fresh water before introducing it into your hydroponic setup!

Thoroughly rinse your product until the water comes out crystal clear. To ensure it is safe, take a sample of the water and test its EC (electric conductivity) and pH values. 

How to Prepare Coco Chip Bricks

One of the best mediums I’ve used for growing cannabis in a hydroponic system is rehydrated coco chips mixed with a #3 or #4 large perlite.


This mixture provides the perfect amount of drainage, allowing me to feed my plants up to 8 times daily.

And you guessed it; more feedings equals bigger yields!

Preparing your coco chips is simple!

8-step process how to prepare coco chip bricks

This blend of coco and perlite has excellent drainage and is lightweight; however, it may not lend enough support to keep your plants upright.

To ensure your plants stay standing strong, add some stakes or a trellis for additional stability.

Key Considerations For Success Using Coco Coir In A Hydroponic System

Coco coir is the perfect growing medium for hydroponic systems due to its excellent water retention, buffering properties, and low nutrient content.

However, there are a few key points you should consider when incorporating it into your system:

  • For the best results, use a premium quality coco coir – this will help guarantee that it doesn’t have excess salt.

  • Prior to use, evaluate the pH and EC levels of your coco for optimal results.

  • Be sure to rinse it thoroughly before use to eliminate any lingering salts.

  • For extra stability, consider incorporating stakes or trellises to your plants’ structure. Doing so will help keep them upright and secure!

  • To ensure your plants are healthy, it’s essential to inspect them frequently for symptoms of overwatering/underwatering, nutrient deficiencies, or disease.

Following these tips ensures that coco coir is an excellent choice for your hydroponic system.

Taking It To The Next Level: How To Increase Your Yields With Coconut Coir Mixes

Hydroponic gardeners strive for maximum yields, and the key is frequent feeding.

I feed my plants 8-10 times daily – a feat made possible by an aerated potting mix that effectively drains away excess nutrient mix to provide plant roots with adequate oxygenation.

Nearly one hundred percent of the oxygen acquired through a plant’s root system is attained from their immediate surroundings(air pockets) and not from the nutrient solution; therefore, proper drainage in your potting mix is essential.

pie chart showing the makeup of dry plant matter-45% oxygen and 45% carbon

When we recognize that dry plant matter contains 45% oxygen, it becomes even more apparent how vital a suitably aerated environment is.

Combining coco chips with perlite provides an optimal balance of oxygen, water retention, and airflow – all critical components for vigorous plant growth.

Perlite is a volcanic glass that, when heated, ‘pops’ and forms an airy, lightweight component.

It comes in many different sizes. I recommend using a larger variety of 1/2 “-1” wide for the best drainage.

An Alternative to Coco Chips

Superior drainage in a hydro system is effortlessly obtained using expanded clay pebbles!

Developed in Germany, Hydroton’s original expanded clay aggregate is an exceptionally lightweight and versatile material and is my favorite choice amongst other clay mediums used for hydroponics.

clay pebbles

This particular clay is mined, molded into pellets, and then heated in a kiln to over 2000 degrees to cause it to expand.

This process results in lightweight clay pellets that are also incredibly durable.

One of the remarkable features of this natural material is its balanced capillary action which provides an optimal surface structure.

For optimal performance, make sure to rinse all expanded clay before use.

It can be reused as often as you’d like so long as it’s completely washed in between uses. The size specification for this product lies within the range of 8–16 mm.

Frequently Asked Questions

Can I Use Coconut Coir In My Hydroponic Garden?


Coconut coir provides natural and organic gardening with an easy transition from soil to hydroponics because the material works like ordinary gardening soil.

Learning to modify a hydro system using regular potted plants and grow lights is very easy, as various types of coconut coir are used for hydroponic usage.

Coconut coir, specifically prepared for hydroponic use, provides a neutral material, which is precisely what you want in a hydro system.

However, coco coir should be thoroughly rinsed before use to ensure no residual sodium or other salts remain because too much salt will cause harm to your plants. Better safe than sorry.

Coconut coir also provides excellent air porosity and drainage, ensuring the roots of your plants get enough oxygen; this is essential for healthy plant growth.

What Are The Different Types of Coconut Coir

You should know the available types if you intend to use coco coir in your hydroponics garden.

Premixed products are available for people who do not want to have to mix them themselves. Here are some common types of coco coir:

coconut fiber for plants

Coco Pith

Coco peat, known as the ‘peat version of coconut coir, is arguably one of nature’s most potent soil conditioners.

It has a delicate, crumbly texture that resembles finely ground coconut husk or peat moss, and it can be used to make a potting mix for enriching your garden beds.

But note that you must use coco peat cautiously- its highly absorbent properties can lead to too much water retention around the roots – thus potentially leading to root rot in plants.

Coco Fiber

After being dried and its long coco fibers removed from the coconut husk, coco fiber doesn’t have as much water retention as processed coir does; however, it helps raise soil porosity and drainage levels significantly in your garden and potting mix.

Coco Chips

Coco chips are situated between lightness and heaviness, similar to a naturally occurring expandable clay pellet.

Unlike coco pith, the chunks are large enough to create air pockets in the soil or growing medium while securely storing moisture simultaneously.

Coconut coir chips have the highest air-to-water ratio of the three types.

These often come in the form of a compressed brick, which needs to be soaked in water before use.

The brick will expand up to five to seven times its original volume, making it very economical.

coco coir bricks

What Are The Benefits of Using Coconut Coir Instead Of Peat Moss

If sustainability is a priority for you, coconut coir should be at the top of your list!

Choosing this renewable resource over peat helps to protect ecologically vital and fragile habitats like bogs.

Additionally, it’s essential to remember that hydroponics never calls for peat moss.

Peat moss is derived from plant matter that has decomposed and accumulated in waterlogged soil over centuries.

However, peat bogs can be decimated within mere weeks, taking many lifetimes to renew.

Unlike peat moss, coconut coir, the abundant byproduct of coconut harvesting, is a renewable resource with remarkable longevity. 

Year after year, new crops are harvested from these trees, and yet, in past years, this material was discarded into landfills – an area where it can remain undecomposed for over a century! 

Bringing coconut coir to your garden reduces landfill waste and brings numerous benefits, such as water retention and pH neutrality.

Bottom Line

Growing plants in coconut coir is a great way to supplement your hydroponics system.

You now know what coconut coir is, why it can be beneficial, how to prepare it for use, test it, and how to increase yields by using a potting mix comprised of a coco chip and perlite blend.

It’s time to put this information into practice! Feel free to get creative–try some coco coir today!

With patience and practice, you’re next grow should have you brimming with enthusiasm over the many possibilities afforded by using coconut coir in your hydroponic system.

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