Spent Mushroom Grow Blocks (Free!)


Spent Mushroom Grow Blocks make a superb compost and soil amendment. These blocks are what’s left after we’ve harvested 1-2 flushes, but they still have a lot of life left in them. There’s a good chance you’ll be able to obtain a 3rd flush by misting the block as a grow kit, before breaking it up into your soil.

Incorporating mycelium into your soil will help plants absorb water and nutrients, as well as build up the immunity of trees and plants. This is called the mycorrhizal network, and it literarily acts as a communication platform between trees and plants!

Re-incorporate spent blocks in your garden’s biome, and get fresh mushrooms straight from your own garden beds (weather permitting). An easy way to do this with the ‘trench-method’.

Free for pick-up only at our storefront! We do not ship spent mushroom blocks. Trailer-full (300 blocks) local delivery available for $100, email us to schedule an appointment.

Step 1: Dig a 1 foot wide x 1 foot deep trench, 2 feet in length per block (ie. 8ft-long trench for 4 blocks).

Step 2: Make a cardboard-mushroom-straw sandwich; line bottom of trench with cardboard, mix in straw with spent mushroom block (broken apart), and cover with cardboard. Cover everything with soil.

Step 3: Let nature do it’s bidding! Your mushroom patch will fruit better if it contains higher levels of moisture. Showering your patch with water on dryer days will help establish your mycelium network, with fruits expected during summer months. Once the mycelium network is established, you can obtain flushes yearly.


Our blocks are made from 50% Organic Oak Pellets, 50% Organic Soy Bean Hulls, and fully colonized mushroom spawn.




4-Pack, 10-Pack, 50-Pack