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Description

Rye Berry Mushroom Jar – Sterilized 1 Quart for Mushroom Cultivation

Out-Grow’s Rye Berry Mushroom Jar is a professionally sterilized 1-quart substrate designed for reliable, fast colonization. Rye berries are one of the most trusted grains in mushroom cultivation thanks to their ideal size, nutrient density, and ability to support healthy mycelial development. This mushroom jar is a clean, convenient solution for growers looking to inoculate bulk substrate or expand to grain-to-grain transfers with confidence.

Lab-Prepared Mushroom Jar with Injection Port and Gas Exchange Filter

Each jar is filled with premium rye berries, fully hydrated and pressure-sterilized at 15 PSI in our commercial mycology lab. The jar is sealed with a self-healing injection port for easy inoculation and equipped with a 0.22-micron gas exchange filter to maintain a sterile internal environment. This combination supports aggressive mycelial growth while minimizing contamination risk — even in non-lab conditions.

Ideal Mushroom Jar for Grain-to-Grain Transfers and Bulk Inoculation

This 1-quart mushroom jar contains the right balance of grain volume and oxygen exchange for colonizing up to 5 pounds of bulk substrate. It’s also well-suited for grain-to-grain transfers and intermediate-stage spawn expansion. Whether you're cultivating oyster, lion’s mane, or other gourmet species, sterilized rye grain offers the structure and nutrition needed to support strong, even colonization.

Backed by Over 15 Years of Mushroom Cultivation Expertise

Since 2010, Out-Grow has been trusted by home growers, educators, and commercial farms alike for professional-grade mushroom cultivation supplies. Our sterilized mushroom jars are produced under strict lab conditions to ensure consistent results with every batch. Store sealed jars in a cool, dry place for up to three months, or use immediately for best performance.

Order now and experience the performance of sterilized rye berry mushroom jars from Out-Grow — the trusted choice for consistent, contamination-free cultivation.

Customer Reviews

Based on 16 reviews
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J
John Tolar

I have used these jars almost exclusively for my past 3 flushes. The last 5 jars have been perfect and it averages 36-49 days depending on strain. I plan to experiment with other spawn mediums but this is definitely my go to.

O
Oldballs
Popcorn

Very satisfied

K
KRIS
Great product

I bought 18 quart jars and so far I've inoculated 12 and all have healthy mycelium growth, none have been contaminated. Definitely not going anywhere else for my grain jars.

R
Richard
Some of the BEST

I have been using out-grow to source grain jars since i started this hobby at the end of 2017 so 7 years now. Any time the jars came busted they sent a replacement no questions asked. I have always had successful growth with little to no contamination. i highly recommend for beginners and advanced hobbyists alike.

c
carrie
fast

colonized way faster than expected