coco fiber potting medium

The Best Coco Coir to Enrich Your Potted Plants and Backyard Garden

Get your garden in tip-top shape.

Sarah Meyers
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Unless you’re a bona fide green thumb, you’ve likely never heard of coco coir before. Pronounced “coco coy-er,” it’s the fibrous husk that comprises the outer layer of a ripe coconut. Gardeners often incorporate this spongy material into potting mix or soil to improve moisture retention, drainage and aeration. Furthermore, since it promotes strong root growth, coco coir can also be used to start seedlings or grow plants hydroponically.

You can find coco coir in a variety of different forms, but one of the most common is in a compressed brick or disc. This sees the small fibers and pithy dust compacted into a hard mass, which is then soaked in water before use. Once wet, the coco coir expands—absorbing approximately nine times its weight in water—and turns into a soft, crumbly mixture that’s ready for your garden, pots or planters.

Here, we’ve selected four of the best coco coir products on Amazon to help you get your garden into tip-top shape.

1. Plantonix Coco Coir Brick

Plantonix is a family-owned outfit from Southern Oregon that supplies high-quality coco coir products across America. This particular set includes five separate bricks that can be soaked and used as necessary. Each brick is 100 percent organic and tips the scales at 1.4 pounds. The high-grade coco coir is washed multiple times with fresh water—you’ll find no harsh chemicals here—to achieve extremely low EC levels (Electrical Conductivity, which refers to salt content). This significantly reduces the risk of salt buildup in your soil and promotes a healthier garden. On top of that, the washed raw material is carefully checked and has all dirt and larger lumps removed to ensure a superior texture.

2. FibreDust Coco Coir Block

FibreDust supplies its coco coir blocks to a number of leading greenhouses around the world—and it’s easy to see why. The high-quality organic mixture has been prewashed to remove salt and offers optimum pH levels of between 5.8 to 6.8. For those unversed in gardening (or science), nutrients are generally most available to plants when the soil is in this pH range. That makes this coco coir perfect for cuttings and seeds as they can easily access the vital nutrients they need to grow. The compact 11-pound block expands to roughly 15 gallons once rehydrated with 5 to 7 gallons of water, which should be more than enough to cover a full garden.

3. Verdana Coco Coir Block

If you’re planning to garden at scale, Verdana’s compressed block of coco coir should be your first pick. The 10-pound slab expands to roughly 18 gallons when immersed in water. That’s the highest amount of coco coir on this list and equivalent of 3 cubic feet of peat moss (another soil filler) which weighs nearly 20 pounds more than this mix. Hence, this product will not only save you time, but it’ll also save your back. The 100 percent natural mixture also has low EC and a balanced pH to encourage root development and plant growth.

4. Mother Earth Coco Coir Plus Perlite Potting Soil

If you’d rather not spend time rehydrating bricks of coco coir, Mother Earth has a nifty solution. This mix features 70 percent of the finest coco coir and 30 percent perlite (another organic soil amendment) and makes for a great alternative to potting soil. Together, the two core ingredients promise increased aeration and drainage, so you can go gung-ho with your watering can without fear of flooding your plants. The mixture also has a nice porous texture that’s akin to traditional soil and can be thrown straight on the garden. As an added bonus, the 13-gallon bag also comes with gloves to protect your hands while you potter about with your plants.

Get your garden into tip-top shape by using one of these four coco coir products available for purchase on Amazon.

Coconut Coir: What It Is, How To Use It, And The Best Brands To Buy

Coco coir is an increasingly popular type of hydroponic growing medium — and for good reason. There are a whole host of benefits to growing with coconut coir that you can and should take advantage of if you’re new to hydroponics.

There isn’t a good, comprehensive guide to coconut coir out there… until now. In this guide, you’ll get just about everything you need to know about coco coir: what it is, its pros and cons, and the best brands to use.

If you just want to skip to the best brands, here they are:

Recommended Nutrients for Coco

* All of these recommendations are explained in more depth below.

What is Coconut Coir?

First, we need to understand what coconut coir actually is.

In the past, when coconuts were harvested for their delicious meat and juice, the coconut husk was considered a waste product. All of the material from the husk to the inner shell of the coconut was a discard product…until people realized it had many applications in gardening and home products.

Everything in between the shell and the outer coating of the coconut seed is considered coco coir. There are two types of fibers that make up coir — brown and white. Brown coir comes from mature, ripe coconuts and is a lot stronger, but less flexible. White fibers come from pre-ripe coconuts and are far more flexible, but much less strong.

Almost all of the coconut coir used for hydroponics is brown coir, as it’s processed even more after initial harvesting.

How is Coco Coir Made?

To get coconut coir ready for hydroponic and gardening uses, it needs to go through extensive processing.

First, they need to remove the coir from the coconuts. This is done by soaking the husks in water to loosen and soften them. This is either done in tidal waters or freshwater. If done in tidal waters, the coconut coir will take up a large amount of salt, which will need to be flushed out by the manufacturer at a later stage.

Then, they’re removed from the water bath and dried for over a year. After the drying process, which is quite extensive, the coir is organized into bales. These bales are then chopped and processed into various formats, from chips, to “croutons”, to classic ground coconut coir.

There’s a whole lot more that goes into the process of making coco coir safe and optimal for horticultural use, but we’ll get into that a bit lower in the article.​

Check out this video on the post-processing from completed coir into a shippable product:​

Pros and Cons to Coconut Coir

There are amazing benefits to using coconut coir in your garden. But just like any other kind of growing media, there are also some downsides to consider before you buy

Benefits of Coco Coir

Good transition from soil gardening – growing in coco coir feels like growing in soil, because the two media look so similar. You can have a completely hydroponic garden that looks almost the same as a soil garden. The only difference is instead of watering with only water, you’d water your coconut coir garden with nutrient-enriched water.

Retains moisture and provides a good environment – coco coir is one of the most effective growing media for water retention out there. It can absorb up to 10x its weight in water, meaning the roots of your plants will never get dehydrated. There’s also a lot of growing media for roots to work through, promoting healthy root development.

Environmentally safe – although I am a fan of using sphagnum peat moss in the garden, there’s no denying the environmental concerns that peat moss poses. Coconut coir doesn’t have the same problems. It can be used more than once unlike peat moss, which breaks down over time. It’s also a repurposed waste product from a renewable resource, unlike the peat bogs where we get our peat moss.

Insect-neutral – most garden pests do not enjoy settling in coconut coir, making it yet another line of defense in your integrated pest management system for your garden.

Can be less complex than “traditional hydroponics” – if growing hydroponically is new to you, coconut coir is a good first step. You can practice the basics of hydroponic gardening without having to buy or build a hydroponic system and perform all of the maintenance that it requires.

Downsides to Coco Coir

Inert – coconut coir is inert, meaning that it has no nutrients within it. It may look like soil, but it is not soil. This means you will need to add hydroponic nutrients and control the pH when using coco coir. Growing in soil isn’t too different though, as many gardeners amend their soil constantly throughout the growing season anyways.

May need additional supplementation – you may find your plants short on calcium and magnesium when using coconut coir, so supplementing with “Cal-Mag” may be necessary.

Needs rehydration – most coco coir products are shipped in dry, compressed bricks. While this saves on shipping cost, it adds labor to your growing process as you’ll need to rehydrate them before you can use them in the garden. This isn’t too hard though!

Mixes can be expensive – garden suppliers know that coco coir can be annoying to work with sometimes, so they’ve started to offer coconut coir mixes. This saves a lot of time, but is pretty expensive — and making your own mix isn’t too difficult.

Types of Coco Coir

When you buy a coconut coir product, you’re really buying three types of coconut coir: the fiber, the pith (or coconut peat), or the coco chips.

Together, they provide a powerful growing medium. Apart, they have very specific benefits. Here’s a look at what each of them are.

Coco Pith or Coco Peat

The “peat” of coconut coir, this basically looks like finely ground coconut or peat moss. It’s so small and absorbent that if you were to use coco peat as your only growing medium, you might drown out the roots of your plants. It must be aged properly to be used as a growing media, as it can let out salts that will kill your plant if you’re not careful. Choosing a coconut coir manufacturer that ages properly is thus crucial for good growing.

Coco Fiber

Coconut fiber adds air pockets into your medium. It’s not very absorbent, which is good because your growing media needs air pockets in order to provide oxygen to the root zone. Coconut fibers do break down rather quickly though, meaning the air pockets they create will also decrease over time.

Coco Chips

Coconut chips are basically an natural type of expanded clay pellet. They’re just made from plant matter instead of clay! They are best thought of as a hybrid between coco peat and coco fiber. They’re large enough to create air pockets, but also absorb water so your plants won’t dehydrate completely.

When using coconut coir in the garden, it is vital that you use the right mixture of these three types for the best results.

How to Choose High Quality Coco Coir

The most important factors in high quality coco coir is how it is harvested, prepared, and processed. Because none of these factors are directly in your control, you have to pick suppliers that follow all of the best practices for coco coir production.

After the coir is separated from the coconuts, it’s stored in piles for a few years. This puts it at risk for pathogens due to the natural pH of coco coir. Most producers that experience this will chemically sterilize the coir so it’s ready for use in your garden. This has its risks as well — it can prematurely break down the fibers and peat.

The absolute best manufacturers of coconut coir will have an iron-grip on their product from harvest to shipping.

They will:

  • Avoid situations that are conducive to pathogen growth
  • Have a dedicated system to control how the coconut coir ages
  • Rinse and wash the coir to flush out salts
  • Create the right blend of pith, fibers, and chips
  • Package and store their product correctly

If that sounds like a lot to look out for…IT IS! Fortunately, you don’t have to do any of that. All you have to do is make sure that it was done, either by asking your local garden shop about the supplier’s practices, or by reading on below where I’ve answered most of these questions for you for each type of coconut coir product I review.

The Best Coco Coir For Your Garden

Now that you have an understanding of what coco coir is, how it’s processed and made, and what to look for when buying it, you’re armed with the info you need to make a good buying decision.

We’ve tested a lot of different brands and learned a lot simply through trial and error. Here are our findings, which you can take with a grain of salt (pun intended).

Top Pick: Urban Worm Coco Coir

This coir is not only our top pick, we stand behind it enough to sell it ourselves.

Urban Worm’s coco coir is a nice, fine particulate and soaks up moisture with ease. It’s perfect not only to use as a substrate for hydroponics, but also as a bedding in your worm farm. Blend this coir into your homemade potting mixes instead of peat moss for a pH-neutral alternative.

You can pick up this coir from our Epic Gardening store.

Other Good Picks: CANNA Coco or FoxFarm Coco Loco

  • Natural plant medium
  • Organic
  • 40l expanded, 8l dry

Both CANNA and Fox Farm are top coconut coir providers.

Both of these brands are known for their quality across their entire product range. Both CANNA and FoxFarm tightly monitor the production of the coconut coir they use in their products, so you can be sure that it’s been properly aged, dried, and flushed of salts.

CANNA sells theirs in 40L expandable bricks, or 50L expanded bags. Which you choose depends on if you want to save a bit of money on shipping and have to rehydrate the medium after receiving it.

Fox Farm sells a 2cu ft. expanded bag that is my personal choice when using an expanded coconut coir medium.

Other Options for Compressed Coconut Coir Bricks

  • Consists of three different types of compressed.
  • Low sodium content
  • Alternative to sphagnum peat moss

Many first-time growers will opt for the cheaper compressed bricks, which is totally OK as long as it is properly rehydrated and prepared before use in the garden.

If you want to go with a compressed brick and can’t find the CANNA bricks, go with the General Hydroponics CocoTek Bale. It’s 5kg and contains a decent mix of coco pith and coco fibers. You don’t need to flush too much salt out of this product either, which is fantastic for first time growers.

Other Options for Expanded Coconut Coir Bags

  • B’Cuzz CocoFiber

B’Cuzz Coco 50L bags are another good option if you can’t find CANNA or Fox Farm products in your area. They have a partnership with a Sri Lankan coir producer, meaning they have full control over the production process as well. It’s another great coir option.

If You Want Coco Chips…

  • Has A Near Perfect Natural Ph Level For Optimum.
  • Premium Aged And Composted For 24 Months And.
  • Specifically Designed With Increased Fiber Content.

Go with this 4.5kg block of coco chips, or Coco Croutons in a 28-liter bag. These are a great addition to your garden if you need to add more aeration to your growing media and want to keep it in the coco coir family.

What Nutrients Do You Need for Coconut Coir?

Because coconut coir is an inert growing media, you will need to supplement your plants with additional nutrition. Remember — this is still hydroponic growing if you are only using coconut coir.

While many people say you need coco coir-specific nutrients, this isn’t absolutely necessary. You can get away with the standard General Hydroponics Flora series, a pH testing kit, and some Calimagic calcium + magnesium supplement.

If you want to mix it up and try something more coco coir specific, there are two options for you to try. These may be good options to pair with the matching coconut coir brand you’ve purchased:

Coconut coir is an amazing growing medium for hydroponic and indoor use. Find out what it is, how it's made, and the best coco coir to use in your garden.