Mushroom Growing Substrates

50/50 Horse Manure and Straw Mix Mushroom Substrate
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50/50 Horse Manure and Straw Mix Mushroom Substrate
  • Model: OG1063
  • Manufactured by: Out-Grow
  • IN STOCK

Price:   Starting at: $6.00

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Out-Grow's 50/50 Mix

50% of our great horse manure based mushroom substrate and 50% golden wheat straw

You can choose either 1 pound bags or 5 pound bags

Mushroom Substrate

This is the perfect mix of our compost and wheat straw. This mushroom substrate will produce great results for dung/straw loving fungi species. You will get much larger yields using this 50/50 mix compared to just casing grains or all-in-one grow bags. This product is sterilized and ready to use at your front door. Simply add your gourmet mushroom spawn to the 50/50 grow bag, reseal it, and mix. Out-Grow's straw/compost mix is one of the best mushroom growing substrates available on the internet. We use only natural and chemical free products to make our substrates.


Wheat StrawHorse ManureCoconut Coir vermiculite

Out-Grow uses field leached and shredded horse manure, shredded golden wheat straw, coconut coir, vermiculite and a couple other secret ingredients to produce a high quality mushroom substrate with a very nice, airy texture. Out-Grow's 50/50 mix will come heat sealed and sterilized in a mushroom grow bag for your convenience. You can grow right in the bag or add to trays or tubs to grow in.

Mushroom Substrate


Customer Reviews:
 1  2  [Next »] 
Date Added: 12/08/2018 by Juston S.
First time ever growing and i split a quart of spawn between 3 lbs of this awesome substrate and i just finished flush 4 or 5 i can't remember. Lol. Amazing!!!!!

Rating: 5 of 5 Stars [5 of 5 Stars]

Date Added: 12/04/2018 by Adam K.
I spawned 1 pint to 1lb of Out-Grow's 50/50 Manure/Straw Substrate. 1 week later, it was colonized. I didn't have everything setup yet, so the casing felt a little dry. I dunked the entire casing before first flush. Today, I'm in the middle of flush 5 and that was the only time I dunked. Performs fantastically! I will definitely use this product again! A+

Rating: 5 of 5 Stars [5 of 5 Stars]

Date Added: 10/05/2018 by Tyler M.
I've been buying this bulk substrate for more than 2 years now and not once have I ever gotten a contamination. You can't go wrong buying from these guys.

Rating: 5 of 5 Stars [5 of 5 Stars]

Date Added: 06/28/2018 by Dominick A.
We at MagicMyco love Mike and out-grow.com the substrates are top notch and makes growing a joy

Rating: 5 of 5 Stars [5 of 5 Stars]

Date Added: 05/10/2017 by Lance A.
This is the fasted colonizing substrate ive seen from a bulk transfer and i used brown rice flour spawn 1: 2 as a experiment! Fast shipping and great prices! Outgrow manure 50/50 substrate is top notch! The prices are very low for such a qauilty product, and for that this site is the only site using for my growing needs! And believe me ive shopped around!

Rating: 5 of 5 Stars [5 of 5 Stars]

Date Added: 05/26/2013 by Brandon O.
Quickly (2 days) received my 1 lb bag of 50/50 to check the quality. 5 days in and colonizing quickly! Definitely worth it. Novice mycologists can grow close to professional grade fungus. Bravo OutGrow! Thanks

Rating: 5 of 5 Stars [5 of 5 Stars]

Displaying 1 to 6 (of 11 reviews)

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