{"product_id":"grain-spawn-jars","title":"Mushroom Grain Spawn Jars","description":"\u003ch2\u003e\u003cstrong\u003eMushroom Jars for Strong, Healthy Mycelium Growth\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eOur Grain Spawn Jars are mushroom jars made to give you a sterile, reliable environment to grow mycelium from the first inoculation to a full harvest. Available in 210ml and 720ml, these mushroom grow jars work for every stage of cultivation, from agar transfers to PF Tek fruiting.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eThree Ways to Use Your Mushroom Growing Jars\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e1. Agar Inoculation\u003c\/strong\u003e \u003cem\u003e(210ml)\u003c\/em\u003e Use the self-healing injection port for spore-to-agar transfers. The sealed port delivers a 95% contamination-free success rate without needing a flow hood or glove box.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2. Grain Spawn and Mycelium Colonization\u003c\/strong\u003e \u003cem\u003e(210ml and 720ml)\u003c\/em\u003e Fill with your preferred grain, inoculate, and colonize. The 720ml jar holds enough colonized grain to support a full monotub. The 210ml works well for smaller runs or experimental batches.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. PF Tek\u003c\/strong\u003e \u003cem\u003e(210ml)\u003c\/em\u003e No extra equipment needed. Inoculate, colonize, and fruit directly from the 210ml jar using the classic PF Tek method, a simple way to grow mushrooms in jars.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eWhy These Mushroom Jars Work\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003ePressure Cooker Safe up to 15 PSI\u003c\/strong\u003e Built to handle full pressure cooker sterilization cycles without cracking or warping. Reliable across many repeated uses.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e95% Contamination-Free Success Rate\u003c\/strong\u003e The self-healing injection port reseals after every syringe injection. Less contamination means fewer failed jars and less wasted grain.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNo Pressure Cooker Required for Beginners\u003c\/strong\u003e These jars can be used with steam sterilization or stovetop methods. You do not need a full pressure cooker setup to get started.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSized for Real Results\u003c\/strong\u003e As spawn jars, the 720ml gives enough grain to colonize a dense pin set in your monotub. The 210ml fits agar work, PF Tek cakes, and smaller grain batches without wasting substrate.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRust-Resistant Zinc Coating\u003c\/strong\u003e Every lid hole is coated with 99% zinc. The coating holds up after repeated sterilization cycles so the lids stay clean and usable long term.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eHow to Grow Mushrooms in Jars: Making Grain Spawn\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat you need:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMushroom jars (720ml recommended)\u003c\/li\u003e\n\u003cli\u003eRye, wheat, or oat grain\u003c\/li\u003e\n\u003cli\u003ePressure cooker\u003c\/li\u003e\n\u003cli\u003eSpore syringe or liquid culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eStep 1 - Prepare your grain\u003c\/strong\u003e Simmer your grain for 60 to 90 minutes until fully hydrated but not split open. Drain well and let it surface-dry before filling your jars.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStep 2 - Fill your jars\u003c\/strong\u003e Fill each 720ml jar about three quarters full. Leave headspace for airflow during colonization.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStep 3 - Sterilize\u003c\/strong\u003e Pressure cook at 15 PSI for 90 to 120 minutes. Let the jars cool completely to room temperature before inoculating.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStep 4 - Inoculate\u003c\/strong\u003e Inject your spore syringe or liquid culture through the self-healing port. No open flame or flow hood needed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStep 5 - Colonize\u003c\/strong\u003e Store at 21 to 24°C in a dark spot. Give the jar a gentle shake once partial colonization is visible to speed up the rest. Full colonization takes 2 to 4 weeks depending on the species.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStep 6 - Use your spawn\u003c\/strong\u003e Break up the colonized grain in your grain jar and transfer it to your bulk substrate or fruiting chamber.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eMushroom Jar Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%;\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003e\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eSmall Jar\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eLarge Jar\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e210ml\u003c\/td\u003e\n\u003ctd\u003e720ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eAgar, PF Tek, small batches\u003c\/td\u003e\n\u003ctd\u003eGrain spawn, mycelium colonization\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure rating\u003c\/td\u003e\n\u003ctd\u003eUp to 15 PSI\u003c\/td\u003e\n\u003ctd\u003eUp to 15 PSI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLid coating\u003c\/td\u003e\n\u003ctd\u003e99% Zinc\u003c\/td\u003e\n\u003ctd\u003e99% Zinc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInjection port\u003c\/td\u003e\n\u003ctd\u003eSelf-healing\u003c\/td\u003e\n\u003ctd\u003eSelf-healing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eFrequently Asked Questions About Mushroom Jars\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/h2\u003e","brand":"EasyMushroomCultivation","offers":[{"title":"4 Small Jars","offer_id":54785881964883,"sku":"JAR-KIT-1","price":14.99,"currency_code":"EUR","in_stock":true},{"title":"2 Small \u0026 2 Large Jars","offer_id":54785881997651,"sku":"JAR-KIT-2","price":16.99,"currency_code":"EUR","in_stock":true},{"title":"4 Large Jars","offer_id":54785882030419,"sku":"JAR-KIT-3","price":18.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0883\/3758\/0371\/files\/Mushroom-cultivation-jars-injection-ports-filters.webp?v=1780674862","url":"https:\/\/easymushroomcultivation.com\/en-eu\/products\/grain-spawn-jars","provider":"EasyMushroomCultivation","version":"1.0","type":"link"}