Day 20. Ready pasteurized sawdust Bulk substrate in bags for Reishi by Shroomok

Pasteurized sawdust with bran substrate for growing reishi mushrooms. Bags are ready for spawn to bulk process. Image from forum thread Day-to-day Reishi growing diary post #9 #1

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• Day-to-day Reishi growing diary

  Day 20 (Part 1). Bulk Bags and Spawn Transfers in a Still Air BoxIt was a busy day because I wanted to divide this one spawn bag into several different transfers:Grain to Agar (G2A) - need to prepare agarGrain to Grain (G2G) - need to have grain bagsGrain to Bulk (Spawn to Bulk - S2B) - need to prepare Bulk bagsSo, I prepared three bags with a substrate mix of 95% hardwood sawdust and 5% rice bran. Gypsum is beneficial, but I didn’t add it.The moisture level is around 60%. I used the traditional "field capacity" test to check:grab a handful of the substrate, squeeze it as hard as you can, and only a few steady drops should come out—this means the moisture level is perfect!For these bags, I used large heat-resistant grow bags, filled them with the substrate, and closed them with plastic cylinder plugs with caps. I then pasteurized them for 8 hours. Once they cooled to room temperature, they were ready for the Spawn to Bulk step. Each bag weighs about 3 lbs (1.5 kg).

Uploaded on Aug 25, 2025

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