Item #: Ujar02
Availability: In Stock
Usually ships In 1-2 Days
  • Natural Organic Brown Rice Flour
  • Vermiculite
  • Mineral Water
  • Liquid worm castings
  • Bee Pollen

Price: $43.00


    Our 8oz Ultimate substrate jars are the quite possibly the best on the net! We have worked for over 15 years looking for perfection! We finally found it! We have combined special organic brown rice flour with vermiculite, mineral water, Liquid worm castings and Bee pollen to create the Ultimate mushroom growing jars! Each jar has four pre-drilled holes in the lid and a top dry layer of vermiculite for added protection. We have customers who have been using our jars for over 10 years simply because no other jars will out-perform ours! With the Fastest possible colonization times, the largest possible mushrooms no other jars will perform like these! We use Ball 100% Glass Canning jars! No plastic substitutes like others sell!

    We hand make every jar the morning your kit ships so your jars are the freshest possible! They are pressure sterilized in our Autoclave for 120 minutes.

    **Click here to read our update page about national canning jar shortages and pricing**

    Overall Customer Rating of 144 Reviews:

    Your mushrooms will love these

    • quality
    • price
    • fast shipping
    These substrate jars are perfect. They were sterilized properly and filled with great materials. No problems with contamination. Your spores will feast on this and grow beautifully. I Highly recommend it to help you get that grow running.

    Substrate jars

    Best I’ve found with good mix of bee pollen and worm castings

    Mushrooms seem to love this stuff

    I'm new to growing mushrooms. So, I've been purchasing this premade substrate. Mushrooms seem to be growing quite well. That's all I can ask for.

    Exceptional colonizing speeds

    Have ordered these jars many times now and I get about a 18-22 day colonization Time while keeping my temps between 75-80, and using between 1-2 ccs per jar . To me the speeds are exceptional and I always get well mixed and not dry jars . If you want a consistent product every time this is the way to go for sure .

    Perfect for a lvl1 mycologist!

    • Easy
    • Price
    The jars are incredibly easy to use together with any of the growing kits. There's really not much else to say. They work just as advertised. The jars can be used again and again once purchased. Personally I use a few as drinking glasses as a reminder of good growing times.

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