Description
Soy hull is the supplement most home growers reach for first, because it is cheap, it hydrates evenly, and it does not turn a mix to soup the way some brans do. At 50% it makes a fast, wet, generous oyster block; at 20% it is the enrichment in a sawdust base for slower species.
Hydrate with boiling water, cover, leave it an hour, then drain back to field capacity before you fill a bag.
Do not run it alone. It needs the structure and carbon of sawdust or pellet behind it, or the block collapses while still wet.
What is in the box
- Bulk dry substrate only. Bags, spawn and supplements are listed separately.
How to grow it
- Hydrate with hot water and drain back to field capacity: no free water from a squeezed handful.
- Pasteurise for oysters and Lion’s Mane, or sterilise under pressure for enriched sawdust mixes.
- Cool to room temperature, then mix in spawn at 5-10% of wet weight.
- Fill your filter-patch bags or monotub, and incubate in the dark.
Care on arrival
Store this bag sealed and dry. Substrate that has sat damp in a warm room will start to sour before you ever open it.
Specifications
| SKU | MGS-SUB-SOY |
|---|---|
| State on arrival | Dry, unprepared |
| You still need | Water, heat and a way to sterilise or pasteurise |
| Best for | Growers running their own 5-40 lb batches |
| Storage | Dry, off the floor, out of the sun |
| Format | Dry bulk growing medium – prepare before use |
Questions
Can I use garden or potting compost instead?
No. Compost is too fine, too variable and usually carries nutrients that invite mould before the mycelium gets a foothold. Pasteurised straw, or hardwood pellet and supplement blends, are the two bases worth working with.
Do I have to pasteurise or sterilise?
Yes, before adding spawn. Pasteurising in hot water suits plain straw and unenriched pellets for oysters and Lion’s Mane. Anything with supplement mixed in wants a pressure sterilisation cycle instead.
Do you sell substrate already pasteurised?
Only in the ready-to-inoculate bags listed under grow bags. Everything on this page is dry and unprepared, because shipping water is expensive and pasteurised substrate travels badly.
How much does a 40 lb bag of pellets make?
Roughly ten 5 lb wet bags once hydrated and drained, which is the single biggest reason people stop buying substrate by the small bag.
Is shipping included, and how do you handle live orders?
Flat rate, free over $95. Kits, blocks and spawn travel in insulated packaging with a cold pack and are dispatched Monday to Wednesday. Dry goods such as substrate, bags and hardware leave the same day if the order is in before 2pm.
Live goods are packed in an insulated mailer with a cold pack and dispatched Monday to Wednesday. Standard shipping is free over $95.
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