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Coco-Fiber Planting Medium

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  • 3 or more: $6.99 each
Item #H16984, 1.4 Pound Brick
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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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Browse 17 questions Browse 17 questions and 92 answers
Why did you choose this?
Stark Bro's Store
Worked well in the past
Lindsay M on Aug 15, 2019
As suggested.
Bonnie P on Jul 7, 2019
Worked well in the past
Lindsay M on Aug 15, 2019
Because it said it would help my clay soil.
Debra C on Jul 14, 2019
As suggested.
Bonnie P on Jul 7, 2019
I have used this product before and I believe it makes a real difference when planting.
Cynthia H on Jun 28, 2019
To help with clay soil
Shufreda C on Jun 24, 2019
have used before and it is WONDERFUL!
Margaret C on May 31, 2019
Our soil is full of slate and clay and it needs more organic matter. I am guessing that coco fiber is more environmentally friendly than peat moss, which I usually use.
Alice H on May 30, 2019
Recommended by you, and I have clay soil.
Gerard D on May 11, 2019
To use with three new fruit trees I have on order.
Ruth M on Apr 27, 2019
We have heavy clay soil that requires amendments. I would like to use this instead of peat moss.
LINDA A on Apr 25, 2019
Recommended as best for growing citrus plants
Charlene H on Apr 16, 2019
To improve clay soil for raspberries
NEAL B on Mar 8, 2019
Good reviews and have soil with a lot of clay, so wanted to try this.
Russell G on Mar 3, 2019
This works very well with my soil conditions, breaks up the clay content for better root growth.
Tina M on Feb 19, 2019
I used this with two blackberry plants last year and it works great. It comes compact and you add water, it amended my clay soil quite well.
Carrie C on Feb 15, 2019
Needing to amend heavy clay soil
Michael U on Feb 11, 2019
Best price around and from a reliable source.
Kathleen E on Feb 8, 2019
I have used this product with orchids. There are a number of products available for growing orchids but I found this mixed with bark and other things works best. I see no reason why it would not work well as a soil supplement in other applications.
Vera B K on Feb 8, 2019
Georgia soil can always use a bit of loosening up!
Victoria D on Jan 17, 2019
Will be adding the Coco Fiber to my seed starter mix.
KATHRYN W on Jan 16, 2019
Growing blueberries in raised containers
ERIC J on Nov 22, 2018
Convenience and I have clay soil.
Terry V on Oct 26, 2018
Our soil is very sandy. Hopefully this will assist the tree for future success.
KAREN M on Oct 25, 2018
To amend the adobe soil where I live.
Brian K on Oct 22, 2018
I have really clay topsoil on my property so I opted to use this to help add some are in floppiness to the ground so the roots can grow
Albert S on Oct 12, 2018
used this on my apple trees and they are doing great.
Jodie N on Sep 25, 2018
We have heard it is helpful for a successful start
Axel F on Sep 24, 2018
Our soil always needs this type of product.
JAMES A on Sep 18, 2018
I have used it before and it works great on my sandy loam soil.
Herman K on May 9, 2018
It works great to keep soil moist and loose.
Kathy G on May 5, 2018
It's great for amending soil
Jennifer W on May 4, 2018
Love this stuff! Our soil drains very quickly and this helps retain moisture!
KATE F on Mar 4, 2018
Stark recommendation and after trying it and seeing how well it helped bare root trees get established I wouldn't buy a tree without it.l
John H on Dec 17, 2017
It works great for seed starting in the Spring, especially blended with worm castings and a little perlite.
Robert H on Nov 20, 2017
Putting new cherry trees in and with our clay soil wanted to make sure they had a good start.
Trudy J on Apr 24, 2017
I'm going to give my apple tree the best start it can have in this environment.
Marsha L on Apr 22, 2017
Works great!!
James E on Mar 6, 2017
Need to treat the heavy clay soil.
Karin N on Oct 26, 2016
I have loamy soil and would like to keep moister in check all season .
David C on Oct 6, 2016
Very little organics in soil of Flagstaff
Eric S on Sep 25, 2016
To help the Sandy soil here in NM to retain moisture.
Diana A on Sep 8, 2016
Used it before. Loved it. Sustainable product. Better than peat
Mary E W on Aug 7, 2016
I love the way it aerates the soil
Charlotte M on Jul 4, 2016
Wanted to compare to using peat.
GARY O on May 15, 2016
Works great in giving that plant the boost it needs to survive and thrive in the early stages of planting.
TRACY V on May 13, 2016
use it mixed with vermiculite as bedding for worm composting
Susan K on May 2, 2016
This is fantastic for pots and for the newly planted trees and roses in my clay soil. I'm in Indiana, and these blocks work better than sand at breaking up the clay and allowing the roots to grow. Good stuff.
Jane P on Apr 5, 2016
I have a lot of heavy clay soil and I found that this product really helps keep the soil from re-compacting after planting. The peach tree I used it on is twice the size of the one I didn't. In addition I use leaf compost and ground tree mulch from the city and incorporate that as well to establish water and air channels.
BRIAN R on Mar 25, 2016
I have used it before, and it is excellent for the soil.
MARGIE B on Mar 15, 2016
We have clay soil and it tends to be wet. Hoping this will give the trees we plan to plant, a good start.
Jeanne D on Feb 16, 2016
Because it said it would help my clay soil.
Debra C on Jul 14, 2019
I have used this product before and I believe it makes a real difference when planting.
Cynthia H on Jun 28, 2019
will this help keep a raised bed damp enough for tomatoes?
John S on Sep 12, 2016
BEST ANSWER: I live in the desert southwest and these are great to keep roots moist
Are you supposed to crumble these bricks or what?
Araceli D on May 17, 2016
BEST ANSWER: If you will just let a whole brick soak in a bucket 3/4 filled with water for 15 or 20 minutes or longer, the brick will begin to crumble on its own. If the brick has not completely fallen apart after soaking for a while, it is a fairly simple matter to crumble any remaining lumps with a little bit of squeezing by hand in the bucket.
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
Dennis S on May 5, 2016
BEST ANSWER: 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!
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?
Homer J. on Sep 12, 2016
BEST ANSWER: 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.
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.
Marilyn H on Oct 10, 2016
BEST ANSWER: 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.
Do you soak the coconut fiber in water before adding it to the soil?
Janet C on Sep 12, 2016
BEST ANSWER: 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?
Teresa F on Apr 28, 2016
BEST ANSWER: In my opinion, it does not smell like coconut. Now, when I order trees ??? it is common for me to receive about 30 trees at one time to plant so I'm not really focused on paying attention to what the Coco fiber smells like. However, I am sure if it did smell like coconut, I would have noticed that.
Can I use it in a pot?
nabaala c on Jun 3, 2018
BEST ANSWER: I used them for planting fruit trees. But I think they would be a great addition to the soil you use in a pot. It would help with water retention and keeping your potting medium light. It really expands when wet, so soak it first according to directions. That way you can use the proper ratio to potting soil. Happy planting!
Is the coco fiber good to use on top of the soil like mulch?
Robin G on Sep 19, 2016
BEST ANSWER: The fiber becomes quite wet when the instructions are followed. It would be hard to use as mulch but works well as a potting medium.
What is the weight of the coir soil when wet? calculate for roof top planting.
Retta F on Jul 29, 2019
BEST ANSWER: The dry brick weighs 1.4 pounds and holds 8-9 times its weight in water, so the total weight for one fully saturated brick would be 11.2 - 12.6 pounds.
Can you show me how you actually would plant a tree using coco fiber blocks?
Tenia R on Oct 26, 2018
BEST ANSWER: Yes, indeed. This is a little older video, so the soil amendment is called Coco-Fiber Potting Soil, but it is the same thing as our Coco-Fiber Planting Medium. Here's a link to the video: //
how much of a brick do you pet per cubit feet of potting mix?
mickey on Mar 24, 2018
BEST ANSWER: First, prepare the brick by soaking it in warm water according to the package directions. Then mix the finished coir about 1 part to 2 parts soil. The difference is quite amazing.
If I add water to break this down, but don't use it all, can I let it dry and reuse it later?
Corinth T on Apr 15, 2017
BEST ANSWER: Yes, you can. Be sure to let it dry out completely - if you seal it up for later use and it's still damp, it will grow mold/compost itself.
I have 2 square foot garden plots (4x4). I would like to use the brick in each plot. One bed I will plant from vegetable seeds; the other bed will be vegetable plants. Can I just use the brick or do I need additional supplies? I reside in Southern California.
Sharon G on Mar 14, 2017
BEST ANSWER: You should always do a soil test to see the level of nutrients and the acidity/alkalinity of your soil. That will be your guide in determining what your soil needs. The coir fiber is an excellent soil amendment no matter what your nutrient levels and soil pH are. We have a soil test kit here: //
Can I use this on pine trees? And does it come with instructions?
Fishy on Jan 26, 2017
BEST ANSWER: It's pH-neutral, so you can use it with any tree or plant. It does come with instructions.
Does the coconut fiber alter the soil Ph?
Lourenco P on Nov 7, 2016
BEST ANSWER: Thank you for your question. No, it does not. It's completely neutral.

Customer Reviews

4.7 / 5.0
29 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Really great stuff!
So far I've used the CocoFiber potting medium with two apple trees and a bush cherry and all three are thriving. Where I live, it is extremely sandy soil and I have had difficulty getting any kind of fruit trees (or even vegetables for that matter) to thrive. I truly believe my happy apple trees are due to this potting medium. I will continue to use it from now on when planting.
May 14, 2016
over 4 years ago
First But Certainly Not Last
This was the first time I had ordered the cocofiber. It will not be the last! I love this stuff. It hydrates quickly, mixes with the soil well and very easy to use. I used one brick for every two trees. The trees must like it too because the are leafing out.
April 18, 2016
over 3 years ago
Works great in breaking up clay
Helps really well to keeps the soil loose for the roots. Ive been using this product for years and wouldn't do it any other way.
May 10, 2017
over 3 years ago
This was really fun to work with for the trees. My friend's kids were over and helped with this part. They loved to see the fiber expand. It worked great and it seems to have made a great impact on the roots as well.
July 1, 2016
over 4 years ago
CocoFiber Potting Medium
This is a miracle addition to any garden. Our garden was absolutely beautiful!
May 4, 2016
over 4 years ago
A real value
I got several bricks of this material and believe they are responsible, in part to the excellent start my trees had. We have very sandy soil and anything that helps hold moisture as these trees are getting started is good. Based on tree growth and vigor, I would say this is the best stuff I have come across to do that job.
June 8, 2017
over 3 years ago
Great To Start Your Tree
This material was easy to use and did what it was supposed to do.....Started the tree off, growing like mad.....
May 23, 2016
over 3 years ago
CocoFiber Potting Medium
I loved this product and really made a difference in tree planting from a pot to the garden.
August 30, 2016
over 3 years ago
CocoFiber Planting Medium
Used this as recommended for the planting of my Fruit Trees. I think it makes a difference. Especially if there is even a slight amount of clay in your soil where planting. Will Use it again with additional plantings.
May 12, 2017
over 3 years ago
Coco Fiber Planting Medium
I had a bit of a difficult time getting the right mixture, but once I did it worked well. I used it for my fall garlic planting. It will be interesting if this works up again for another planting, or if I will need to re-order.
September 28, 2016
over 3 years ago