Sawdust Bulk substrate ready for spawn to bulk - Day-to-day Reishi growing diary by Shroomok

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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 Apr 4, 2025

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