Item #: Ujar02
Availability: In Stock
  • Natural Organic Brown Rice Flour
  • Vermiculite
  • Mineral Water
  • Liquid worm castings
  • Bee Pollen

Price: $35.00


    Our 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.

    Overall Customer Rating of 108 Reviews:

    Fast colonizers and contam resistant-great jars!

    As the title says, these are great. I've done two rounds using these jars, and each time they've colonized VERY fast (mycelium within a day), and had zero contams.

    I had one damaged jar in each order, but Midwest was super responsive in offering free replacements.

    I use these for cakes to bulk tubs, and results have been great. Highly recommend.


    Fool proof

    • HEarty
    • effective
    • great packaging
    • NONE
    These jars have been 100% effective and hearty with almost no maintenance while awaiting birth! Not 1 jar has ever failed to colonize a cake, fruit and produce several flushes

    Joshua Tree area, Mojave Desert

    all is well

    • quality-timely delivery
    • good price
    • none
    I think it arrived a week ago and was left at a secure place not visible from the street. It was 12 substrate jars. I've used them before from Midwest. I opened the box and they looked fine. I've resealed the box and won't innoculate until Sept. 1.

    Really Great for Beginners!

    • quality
    • price
    • ease of use
    Bought these for my first attempt at growing and they worked like a charm! Already restocked! Thank you!



    • Everything
    • Haven’t found any
    Always timely and helpful

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