Premium 5-Grain Spawn Bags | Sterile Grain Bags for Mushroom Cultivation
Premium 5-Grain Spawn Bags | Sterile Grain Bags for Mushroom Cultivation is backordered and will ship as soon as it is back in stock.
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Description
Description
Our Premium 5-Grain Spawn Bags are sterilized mushroom grain bags filled with a blend of rye, white and red milo, and white and red millet — mixed kernel sizes that spread through bulk substrate for more inoculation points. Each 2-pack holds two 2.25–2.5 lb bags with a 0.22 micron filter patch and a self-healing injection port.
Rye, milo and millet in a sterile 0.22 micron filter bag with a self-healing port. Inject, colonize, then spawn to bulk.
This has been our best-selling spawn for more than a decade. Every batch is made fresh in-house and pressure-sterilized, so it arrives ready for your liquid culture or spores.
- 2 bagsPer pack
- 2.25–2.5 lbsPer bag
- 5 grainsRye, milo, millet
- 0.22 µmFilter patch
- 3 hrsSterilized, 18 PSI
Why growers pick 5-grain spawn
Small millet and milo kernels fill the gaps between larger rye berries, so the spawn spreads more evenly through substrate.
A 0.22 micron patch lets the bag breathe while keeping contaminants out, and the high-temp port reseals after every injection.
Mixes evenly into coir, manure-based and other bulk substrates for monotubs, trays and larger fruiting setups.
What's in the pack
- 2 × Premium 5-Grain Spawn Bags, 2.25–2.5 lbs each (about 2 quarts)
- Unicorn 10T polypropylene bags, 3 mil, with a 0.22 micron filter patch
- High-temperature self-healing injection port on every bag
- Step-by-step photo grow guide plus advanced bulk grow instructions
How to use them
Four steps from a sterile bag to bulk spawn.
1Inoculate
Wipe the port with alcohol, then inject 5cc of spore solution or 7–10cc of liquid culture. Not sure how many syringes? Use our syringe calculator.
2Incubate
Keep the bag at 72–76°F, out of direct light and undisturbed, until mycelium is clearly growing.
3Break and shake
At about 25–30% colonization, gently break up and massage the grain to spread the mycelium, then let it finish colonizing.
4Spawn to bulk
Once the bag is fully white, break it up and mix it evenly into pasteurized bulk substrate in your monotub.
New to grain spawn? Our Spawn Bag & Grain Jar Guide walks through inoculating, incubating and fully colonizing spawn bags and grain jars step by step.
Made fresh, built to break apart
A fully colonized 5-Grain bag, ready to spawn
Every batch is soaked, simmered and surface-dried to cut down on clumping, hydrated with a fortified mineral blend, then pressure-sterilized at 18 PSI for 180 minutes.
- Less clumping at break-and-shake
- RO + mineral water with gypsum, Calcium+ and DAP
- Our best-selling spawn for 10+ years
Plan on about 1 part grain to 3 parts bulk substrate.
One bag fills a Medium 44Q; this 2-pack fills a Large 66Q.
How much spawn for your monotub?
A good starting ratio is about 1 part grain to 3 parts bulk substrate.
| Monotub | Spawn bags | Bulk substrate |
|---|---|---|
| Small 28Q | ½ bag | 4–5 lbs |
| Medium 44Q | 1 bag | 7.5 lbs |
| Large 66Q | 2 bags (this 2-pack) | Up to 10 lbs |
Specifications
| Specification | Detail |
|---|---|
| Grain blend | Rye berries, white milo, red milo, white millet, red millet |
| Weight | 2.25–2.5 lbs per bag (about 2 quarts) |
| Pack size | 2 bags |
| Hydration | RO + mineral water with gypsum, Calcium+ and DAP |
| Sterilization | Autoclaved at 18 PSI for 180 minutes |
| Bag | Unicorn 10T polypropylene, 3 mil |
| Filter patch | 0.22 micron |
| Injection port | High-temp self-healing |
| Inoculation | 5cc spores or 7–10cc liquid culture |
| Incubation | 72–76°F |
| Shelf life | Best within 90 days; up to 120 days refrigerated |
Storage: Every bag is made fresh. Inoculate within 90 days for best results, or refrigerate unopened bags to keep them up to 120 days.
Build out your bulk grow
5-Grain Spawn BagsThis product
Original Rye BagsSingle-grain spawn
Select Substrate 7.5 lbBulk substrate
Grower's Select 44QFits one bag
| 5-Grain Bags | Rye Bags | Select 7.5 lb | 44Q Tub | |
|---|---|---|---|---|
| Use it for | Even spread through bulk | Classic single-grain spawn | Spawning to bulk | Fruiting |
| Contents | 2 bags: rye, milo, millet | 2 bags: organic rye berries | 7.5 lbs bulk substrate | Tub, filter disks, liner |
| Step | Inoculate & colonize | Inoculate & colonize | Spawn to bulk | Fruit |
| Pairs with | 7.5 lbs substrate per bag | 7.5 lbs substrate per bag | One spawn bag | One bag + 7.5 lbs substrate |
Pair it withMix colonized spawn into bulk substrate in a monotub. Need genetics? Browse our liquid culture syringes or spores from Spore Genetics.
Common questions
What grains are in the 5-grain blend?
Rye berries, white milo, red milo, white millet and red millet. The mix of kernel sizes gives more inoculation points when you spawn to bulk.
How much liquid culture or spore solution should I use?
Inject 5cc of spore solution or 7–10cc of liquid culture through the self-healing injection port. Wipe the port with alcohol and use a sterile needle first.
When should I break and shake the bag?
At about 25–30% colonization. Gently break up and massage the grain to spread the mycelium, then let the bag finish colonizing.
How much substrate does one bag go into?
About 7.5 lbs of bulk substrate, which fills a Medium 44Q monotub. Use both bags for a Large 66Q with up to 10 lbs of substrate.
Is condensation inside the bag normal?
A little condensation can form when the bag goes through temperature swings in shipping. Let it sit at room temperature before you inoculate. The filter patch lets the bag breathe while keeping contaminants out.
Can I use it for gourmet mushrooms?
Yes. Grain spawn works for gourmet species such as lion's mane and oysters too. Once the bag is colonized, spawn it to the substrate your species prefers.
How long do unopened bags keep?
They are made fresh. Use them within 90 days for best results, or refrigerate them to keep them up to 120 days.
Should I choose 5-grain or rye?
Both are sterilized in-house and inoculate the same way. The 5-grain blend has mixed kernel sizes for more inoculation points; rye is the classic single-grain spawn with uniform, larger kernels.
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