Dry Bulk Substrate (Coco Coir, Vermiculite, Gypsum)

This is dry ingredients to make one 5 gallon batch of bulk substrate for your home grown mushroom grow (Step 3 on my Beginner Mushroom Guide). All you need is a 5 gallon bucket with a lid and 16 cups of boiling water. Included is 500 grams of Coco Coir, 500 grams of Vermiculite, and 100 grams of Gypsum.

Bulk Substrate Ingredients:
500 grams Coco Coir
500 grams Vermiculite
100 grams of Gypsum

Needed At Home:
16 Cups Boiling Water
5-gallon bucket with lid

First add coco coir and vermiculite to the 5-gallon bucket. Next, boil 16 cups of water. After the water comes to a complete boil add the gypsum. Let the water come back to a boil and then carefully pour into the 5-gallon bucket. Close with a lid and let sit for at least an hour and then mix. Let it sit to hydrate and cool for approximately 24 hours. Ideally keep insulated to aid the pasteurization process. Once room temp, double check to make sure it is at field capacity and mix in your colonized grain spawn.