The Original Rye Spawn Bags
The Original Rye Spawn Bags is backordered and will ship as soon as it is back in stock.
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Description
Description
Our Original Rye Spawn Bags are sterilized rye grain spawn — over 2 quarts of organic rye berries per bag, hydrated with mineral water and gypsum, sealed in a 0.22 micron filter bag with a self-healing injection port and pressure-sterilized for 3 hours. Inoculate with liquid culture or spores, colonize, and spawn to bulk.
Over 2 quarts of organic rye berries per bag, hydrated with mineral water and gypsum and pressure-sterilized for 3 hours.
Rye berries are one of the most widely used grains for mushroom spawn: consistent kernel size, good moisture balance and plenty of nutrients. Every batch is made in our own autoclave, so each bag arrives ready to inoculate.
- 2 bagsPer pack
- 2.25–2.5 lbsPer bag
- RyeOrganic berries
- 0.22 µmFilter patch
- 3 hrsPressure-sterilized
Why growers pick rye spawn
Uniform kernels with good moisture balance and nutrient density for dependable colonization.
A 0.22 micron patch lets the bag breathe while keeping contaminants out, and the high-temp port reseals after every injection.
Mixes into coco coir, manure-based blends or Master's Mix for monotubs and grow bins.
What's in the pack
- 2 × Original Rye Spawn Bags, 2.25–2.5 lbs each
- Cereal-grade organic rye berries hydrated with mineral water and gypsum
- 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 guide plus instructional videos
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 rye 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.
From rye bag to bulk flush
A bulk flush from grain spawn
Every batch is soaked overnight, simmered, bagged and pressure-sterilized in our own autoclave for 3 hours, then shipped fresh.
- Kernels separate cleanly at spawn time
- Mineral water + gypsum hydration
- 3-hour pressure sterilization
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 | Cereal-grade organic rye berries |
| Weight | 2.25–2.5 lbs per bag (over 2 quarts) |
| Pack size | 2 bags |
| Hydration | Mineral water and gypsum |
| Preparation | Soaked overnight, simmered, bagged |
| Sterilization | Pressure-sterilized for 3 hours in-house |
| 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
Original Rye BagsThis product
5-Grain Spawn BagsMixed-kernel spawn
Select Substrate 7.5 lbBulk substrate
Grower's Select 44QFits one bag
| Rye Bags | 5-Grain Bags | Select 7.5 lb | 44Q Tub | |
|---|---|---|---|---|
| Use it for | Classic single-grain spawn | Even spread through bulk | Spawning to bulk | Fruiting |
| Contents | 2 bags: organic rye berries | 2 bags: rye, milo, millet | 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
Why use rye grain for mushroom spawn?
Rye berries have a consistent kernel size, good moisture balance and plenty of nutrients, which makes them a dependable grain for colonizing and spawning 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 rye or 5-grain?
Both are sterilized in-house and inoculate the same way. Rye is the classic single-grain spawn with uniform, larger kernels; the 5-grain blend mixes kernel sizes for more inoculation points.
