Bulk Organic Rye Berries

Bulk Organic Rye Berries are USDA Certified Organic, triple-cleaned whole rye for making your own mushroom grain spawn. Sold in 40 lb bags or by the 2,000 lb pallet, with pallet freight included to the lower 48.

Rye is the gold-standard spawn grain for gourmet and medicinal mushrooms. It hydrates evenly, holds moisture without turning to mush when prepared right, and gives mycelium the nutrition it needs for fast, even colonization in jars and spawn bags.

• USDA Certified Organic
• Triple-cleaned
• Whole dry grain
• Jars & spawn bags

• 40 lbsPer bag
• 2,000 lbsPer pallet
• OrganicUSDA certified
• TripleCleaned
• Free freightPallets, lower 48

Why growers pick rye berries

• Even hydration – Rye takes on water evenly and holds it without free water pooling in the jar or bag.
• Nutrition for fast colonization – Carbohydrates, protein and bran support mycelium through the lag phase after inoculation and on to full colonization.
• Works across species – Oyster, lion’s mane, shiitake, reishi, cordyceps militaris and most other gourmet species colonize rye well.
• Clean grain – Triple-cleaned, so there is less dust and debris to rinse out before you cook it.
• Scales with you – Start with a 40 lb bag, then move to a pallet once you are producing spawn every week.

What you get

• 40 lb bag of USDA Certified Organic dry rye berries, or
• Pallet: 2,000 lbs, freight included to the lower 48 United States

How to make rye grain spawn

The short versionRinse, hydrate, dry the surface, then pressure-sterilize. Grain spawn must be sterilized, not just pasteurized.

1. Rinse. Rinse the rye until the water runs mostly clear.
2. Soak and simmer. Soak overnight, then simmer for 15–20 minutes. Stop before the kernels split — overcooked rye goes mushy and invites bacteria.
3. Dry the surface. Drain and spread the grain on a clean surface until the outside of each kernel looks dry. A kernel pressed between your fingers should give slightly without releasing water.
4. Fill jars or bags. Load filter-patch spawn bags or grain jars, keeping filters clear of wet grain.
5. Sterilize at 15 PSI. Quart jars and 1–3 lb bags: 2.5 hours. Larger or denser loads: up to 3–3.5 hours. Start timing once the load is actually at temperature.
6. Cool, then inoculate. Let jars or bags cool fully, ideally 12–24 hours, then inoculate with sterile technique. Most gourmet species colonize best at 75–82°F.

Specifications

FAQ

• Bulk dry grain
• Grain spawn guide
• Sterilized spawn bags