Midwest Grow Kits
3-Pack Original Rye Grain Jars (32oz)
3-Pack Original Rye Grain Jars (32oz)
3-Pack Original Rye Grain Spawn Jars (32oz Wide Mouth)
Sterile Rye Berry Mushroom Spawn Jars for Easy Inoculation, Reliable Colonization & Bulk Growing
Start your grow with one of the most trusted grain spawn options in mushroom cultivation. The Midwest Grow Kits 3-Pack Original Rye Grain Spawn Jars includes three 32oz wide mouth sterilized rye berry jars prepared for clean inoculation, dependable colonization, and easy expansion into bulk substrate, monotubs, grow bags, or additional grain spawn.
Each jar is filled with properly hydrated premium rye grain, a classic choice for mushroom spawn thanks to its moisture retention, nutrient profile, and grain size. Rye berry spawn jars are widely used by growers who want a reliable, easy-to-work-with substrate for spores or liquid culture.
Why growers like rye grain jars: Rye berries offer an excellent balance of moisture, nutrition, and grain structure, making them a dependable choice for clean colonization, shake recovery, and expansion into larger bulk growing projects.
Why Choose Our Rye Grain Spawn Jars?
- Reliable Colonization – Premium rye grain offers a proven environment for healthy mycelium growth.
- Clean & Easy Inoculation – Self-healing injection ports make spores and liquid culture simple to use.
- Dependable Gas Exchange – Each lid includes a 0.22 micron filter patch for airflow while helping resist contamination.
- Sterile & Ready to Use – Professionally prepared and sterilized for immediate inoculation.
- Great for Bulk Growing – Excellent for spawning to casing mix, bulk substrate, monotubs, and grow bags.
- Beginner Friendly – A simple and dependable way to begin with grain spawn jars.
What’s Included
- Three (3) 32oz Wide Mouth Glass Rye Grain Spawn Jars
- Premium Hydrated Rye Grain
- 0.22 Micron Filter Patch for gas exchange
- Self-Healing Injection Port for clean inoculation
- Professionally Sterilized Grain Spawn Jars ready for spores or liquid culture
Product Specifications
| Component | Details |
|---|---|
| Jar Size | 32oz Wide Mouth Glass Jars |
| Pack Size | 3 Jars Per Pack |
| Grain Type | Premium hydrated rye berries |
| Filter Type | 0.22 micron filter patch |
| Injection Port | Self-healing port for spores or liquid culture |
| Preparation | Professionally hydrated and sterilized |
| Recommended Inoculation | 3–4cc per jar |
| Use Case | Spawn production, monotubs, grow bags, grain expansion, bulk substrate cultivation |
Recommended Usage Chart
Use this quick chart as a general guide when planning your bulk grow.
| Application | Recommended Amount | Notes |
|---|---|---|
| Spore Syringe per Jar | 3–4cc | Inject through the self-healing port for clean inoculation |
| Liquid Culture per Jar | 3–4cc | Works well for faster colonization when using clean culture |
| Bulk Substrate Ratio | 2 jars per 5 lbs of casing mix | Recommended for monotub and bulk substrate grows |
| Best Use Case | Monotubs, grow bags, trays, bulk grows | Excellent for expanding colonized grain into larger fruiting setups |
Why Rye Grain Still Matters
Rye berries remain one of the most popular grain spawn choices for a reason. Their size, texture, and moisture-holding ability make them easy to inoculate, easy to shake, and dependable for strong mycelium colonization. For growers who prefer a classic grain spawn format, rye jars continue to be a proven option.
These jars are especially useful for growers moving into bulk substrate cultivation, monotub growing, and spawn expansion, where clean and vigorous grain spawn can make the rest of the process easier and more consistent.
From Jar to Bulk Monotub Grow
The video below shows the process of inoculating a grain jar, allowing it to colonize, breaking it up, and mixing it with substrate for a bulk monotub grow.
Premium Rye Grain Spawn Jars for Mushroom Cultivation
The Midwest Grow Kits 3-Pack Original Rye Grain Spawn Jars gives growers a sterile, ready-to-use rye berry spawn option designed for dependable colonization and easy expansion into bulk substrate. Whether you are inoculating with spores or liquid culture, these jars provide a clean and reliable starting point for mushroom cultivation projects of all sizes.
New to Grain Spawn?
Learn exactly how to inoculate, incubate, and fully colonize your spawn bags or grain jars with our step-by-step guide.
Read the Full Guide →
- All-in-one, ready to grow
- Produces multiple flushes
- High-quality, USA-made
- Great for home or classroom use
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