Grow Supplies
Sterilized Grain Spawn Bags with Self-Healing Injection Port — 4-Pack
Four sterile millet & sawdust grain spawn bags with self-healing injection ports at a lower per-bag price — ideal for growers running multiple inoculations between single bags and full pallet orders.
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Switch sizes without leaving the page- • USDA Organic Certified · grown on our 70-acre Pennsylvania farm
- • Hand-packed for freshness · grower support included with every order
Our 4-Pack of Sterilized Grain Spawn Bags with Injection Port gives growers running multiple inoculations a lower per-bag price without committing to a full pallet. Each 6 lb bag is made with the same balanced blend of millet and sawdust, pre-sterilized and hydrated to the ideal moisture ratio to support vigorous mycelial expansion. Every bag includes a self-healing injection port and filter patch — the self-healing silicone port seals automatically after each injection, allowing multiple inoculations without risking contamination.
Consistency matters when you're running several grows at once, and every bag in this 4-pack is sealed in front of flow hoods, wiped with hospital-grade sterilizers, and stretch-wrapped to the same standard as our single bags — so you're scaling up without sacrificing reliability from bag to bag.
Optimized for use in clean environments between 70–78°F, this grain substrate supports a wide variety of mushroom species, delivering fast colonization and vigorous growth. A practical middle step for growers moving from a single test bag toward larger production.
Need more? Check out our Pallet option for bulk and wholesale pricing.
