Master’s Mix Prepared Mushroom Substrate – 40 lb Bulk Bag

Description

Masters Mix Mushroom Substrate Bulk – The same 80/10/10 kiln-dried hardwood, bran and soy hull blend as the 10 lb bag, in a heavy 40 lb paper bag for growers filling eight to sixteen bags at a time.

Masters Mix Mushroom Substrate Bulk: what you get

Masters Mix Mushroom Substrate Bulk arrives as 40 lb, as the listing states it. Variations are sold as sealed or packed so it survives a courier, not just a shelf.

• 40 lb, as the listing states it
• sealed or packed so it survives a courier, not just a shelf
• the same photograph as the listing, so you know what arrives

How to use masters mix mushroom substrate bulk

Nothing about masters mix mushroom substrate bulk is difficult, and almost every failed grow we hear about breaks at one of four points: moisture, temperature swings, still air being taken for clean air, and opening things too early. These four steps cover masters mix mushroom substrate bulk in any shop-bought setup.

1. Hydrate to field capacity: a handful squeezed hard should show moisture between the knuckles but not drip.
2. Pasteurise straw and manure-free mixes at 60-80 C for 1-2 hours, or sterilise supplemented mixes at 15 PSI for 2.5 hours.
3. Drain to the correct moisture before you inoculate – free water in the bottom of a bag is the classic contamination route.
4. Inoculate while the substrate is still warm for grain spawn, or fully cool for liquid, and shake so spawn sits through the mass, not on top.

Storage and handling

Keep the pack sealed until you are ready to work, and write the delivery date on it – grain-based and live material are the two things nobody should use on memory.

Common questions

How should I store a 40 lb bag?

Closed, off a concrete floor, dry and cool. Fold the top over and put it in a bin with a lid if the room is damp. A dry mix stored like that keeps for many months.

Can I split the bag into smaller sterilisations?

Yes – hydrate only what you will run that day and keep the rest dry. Once it is wet, it wants to be sterilised and inoculated within about a day.

Is the freight on a 40 lb bag included in the $25 flat rate?

Yes. We ship substrate by the same flat rate as everything else, and free shipping over $500 applies to the subtotal, not the weight.

Usually ordered with Chopped Wheat Straw Mushroom Substrate – 10 lb and Hardwood Fuel Pellets for Mushroom Substrate – 40 lb. The substrate archive covers mixes, hydration and the pasteurise-versus-sterilise decision. Mushroom Substrate. For the technique side we keep FreshCap on substrates open while writing these pages, and the sanitation notes for the consumables follow the FDA Food Code.

For anyone who has decided this is a hobby with a shelf, not an experiment with a kitchen counter. Same blend as the 10 lb bag, same price-per-pound logic as buying the big bag of anything: you are paying for less packaging per pound and driving further for it.

What is in the box

• The same 80/10/10 kiln-dried hardwood, bran and soy hull blend as the 10 lb bag, in a heavy 40 lb paper bag for growers filling eight to sixteen bags at a time
• Dry and shelf-stable: store it closed, off a concrete floor, and out of the sun so it does not sour or take on mould before you use it
• Sized for home growers – enough for about 16 five-pound bags of hydrated substrate
• No spawn or bags included; this is the raw material tier

How it works

1. Rehydrate to field capacity: damp and heavy, with a few drops escaping when you squeeze a handful hard, not a stream.
2. Pasteurise for straw and litter-based mixes (140-160°F for an hour or two) or sterilise supplemented sawdust blends at 15 PSI for 2-2.5 hours per 5 lb bag.
3. Cool before inoculating, then mix spawn through evenly and bag or bed immediately.

What to expect from this grow

Substrate quality is the variable most home growers skip. Wet it properly, drain it properly, and do not let a batch sit in a warm bucket overnight before you sterilise it.

Specification

Product type	Mushroom substrate
Stage	Substrate and amendments
Size	40 lb dry
Shipped weight	41.5 lb
Package size	22 × 15 × 6 inches
SKU	MGS-0031

Part of our Mushroom Substrate range. Questions about this product? Email [email protected] or call +1 970-909-8532.