Frequently Asked Questions

What is the substrate made from?

Soybean hulls and sawdust. These two by-products contain all the nutrition needed to produce those beautiful flushes of mushrooms. 

Inside the substrate there is also some whole oat grains from the mushroom "spawn". Spawn is grain that is covered in mushroom mycelium. Its where all that white mycelium came from in the grow kit.

Let's put it this way - if the mushroom is an alien invader plotting to take over planet grow kit, then the oat grain is the spaceship that the aliens arrive on.

How do I store my kit if I'll be away from home?

Unopened kits can be stored in the fridge for a few weeks to extend their lifespan - though species such as Blue Oyster tolerate the cold better than others. 

Cooler, darker places such as dungeons are also effective at preventing unopened mushroom kits from expressing themselves. 

Just open your kits as soon as you can - they can't wait to turn themselves into food for you.

Help! Some strange dust is collecting under my mushrooms / My mushrooms are growing a beard.

Your mushrooms are dropping spores! This is a sign that the mushrooms have grown a bit too long and are ready to harvest.

You can also take this opportunity to begin your adventure as a junior mycologist - scoop those spores onto the used coffee grounds that you forgot to empty out of the coffee maker this morning and you could end up with your very own mycelium network. 

My question isn't listed here.

Send us an email at and we'll be happy to answer any questions. This also helps us as we can add your question to our FAQ list!