Coco-Fiber Planting Medium

$9.99
Each
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  • 3 or more: $6.99 Each
1.4 Pound Brick.
Item #H16984
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Description

The perfect sterile growing medium. Use this expandable brick of all-natural coconut fiber (coir) to enhance your soil, making it easy for plants to stretch out their roots. Loosens hard clay soil and adds water-retaining fibers to sandy soil. Resists compacting and remains porous for air circulation. Made from coconut husks. Expands to over 2 gallons when you add lukewarm water as directed. Each brick breaks down into enough coir medium for approximately 4 trees.

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Questions & Answers

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64 Questions
Why did you choose this?

Very effective moisture retainer here in central valley of California

I’ve found that using coir when I’m doing new plantings really does seem to help shrubs and young trees get established. I’ve tried using some other brands of coir, but think that the Stark Brothers…

Want to try this in my greenhouse this winter / spring to start plants.

recommended

will this help keep a raised bed damp enough for tomatoes?

I live in the desert southwest and these are great to keep roots moist

Are you supposed to crumble these bricks or what?

If you soak it in water it will separate into a nice medium. Let it sit in hot water 15-30 minutes.

We ordered 6 trees and six coco fiber bricks. Is it ok to use 1 brick per tree? The soil is hard limestone. I dug a 3x3 foot 18" deep hole for each
tree.

It really does expand as described, which amazed me and it is peat-like when moistened. One brick per tree is a good start but I would add in some compost, organic top soil or garden soil as well. Remember that much organic material that you add to native soil will eventually degrade so give those trees a good start. Don't just plant the tree directly into the coco fiber/compost: thoroughly mix it with equal amount of native soil. Good luck!

Can it be used for tomatoes, peppers, cabbages it squash ( tuberous plants like sweet potatoes)? In Colorado the clay soil is difficult to break down. I've added 2-3 inches a year and can only till down that far each spring.

Coco-Fiber Potting Medium improves the soil for ANY kind of plant. It is pH-neutral and will not affect the acidity/alkalinity of the soil. It does a wonderful job of loosening clay soil.

Can I use it in a pot?

Coco is great in pot but you might have to water or at least check the moisture daily. It’s actually my favorite medium! Start to finish! I make a tea type food with the water when watering. Perfect for everything really.

I am considering this for my fall garlic planting. All questions and reviews thus far relate to trees. How is this used in a prepared garlic bed?

Thank you for your question. You would use this the same way as you would for tree-planting. It is an excellent soil amendment. Well-drained/aerated soil makes garlic bulbs bigger and a little sweeter, and they will be much easier to dig up when it's time to harvest them.

Do you soak the coconut fiber in water before adding it to the soil?

Yes you do add the water it tells you to in the directions. And mix it and break it up in a 5 gallon bucket, it will expand to fill the whole bucket. Then add it to the soil. Pretty neat stuff!

Does this smell sweet like Coconut or does it smell like hay?

I actually didn't notice a smell at all. But if you really try hard, you can determine a faint hay/straw smell. But again I had to really try to even notice.

I may want to store those bricks in my garage. How long can they sit on the shelf?

I think if you keep them away from moisture, they’ll last indefinitely. They’re just shredded coconut husks. I kept some in the garage for ten months, right through the dread Iowa winter, and the bricks fluffed up just fine when I dumped them in a bucket of water in spring. You want to make sure they’re stored in a dry location.

Just how will it help my clay soil?

It has been great for my clay soils for all of the trees and plants I have used it on.
It loosens the compaction to allow water to get to the roots and for easier growth. It also stays moist long after a rain or watering event.

Customer Reviews

80 Ratings
4.7out of 5 stars
80 Ratings

Rated 5 stars by 84% of reviewers

Rated 4 stars by 8% of reviewers

Rated 3 stars by 4% of reviewers

Rated 2 stars by 0% of reviewers

Rated 1 star by 5% of reviewers

1-10 of 80 Reviews
Rated 5 out of 5
Jul 21, 2025
Good product
Directions to moisten and expand the blocks are clear and worked when followed. I'm glad they store well, because I bought a 6-pack and didn't use as many as I thought I would. Now, I'll have some ready for early next year projects.
Rated 5 out of 5
Mar 3, 2025
Will keep using as planting.
Every tree I have put this under just before planting it has been growing impressive.
Rated 5 out of 5
Feb 9, 2025
Environmental friendly in a win win
I bought this to try it and see if it was as good as dirt. It worked well. I'm very glad I bought it and ended up buying 3 more. I don't use it buy itself?. I mix it with dirt and perlite. It saves on the cost and helps with the environment so it's a win win:
Rated 5 out of 5
Jan 30, 2025
Soil Bricks
So easy to use and set up plus it's a lot lighter! Helps aerate the soil mixes well and holds water well
Rated 5 out of 5
Oct 8, 2024
great to mix with potting soil.
great to mix with potting soil. I also use this to start seeds. It is great for holding moisture
Rated 5 out of 5
Sep 10, 2024
All of my fruit trees and bushes have been Stark Bros. purchases and are doing very well.
This worked beautifully in helping me fill my planters for a beautiful harvest.
Rated 5 out of 5
Aug 20, 2024
Nice for staring seeds. Holds moisture pretty well. Sometimes I mix it with Promix microrrhiza to get the good fungi.
Rated 5 out of 5
Aug 20, 2024
Excellent soil amendment
I think coir bricks are great! Very useful for improving soil. I happen to like the Stark Brothers coir best. You'd think shredded coconut husks would be interchangeable, but the coir Stark Brothers sells just seems to have a better texture, somehow.
Rated 5 out of 5
Aug 10, 2024
Panting must have!
It's the perfect edition to getting trees and plants off to the best start! It's easy to use and store well when you order items in advance.
Rated 5 out of 5
Jul 10, 2024
Lasts a long time
This was a really great product. The small brick expanded a lot, and it lasted a long time! I just mixed it in with potting soil to make a better potting soil from all my plants and seed starting.