Item #: ujar01
Availability: In Stock

6 Ultimate 1/2 Pint Substrate Jars Include:

  • Natural Organic Brown Rice Flour
  • Vermiculite
  • Mineral Water
  • Liquid worm castings
  • Bee Pollen
  • Fully Sterilized - Ready to go!

Price: $20.00


    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 116 Reviews:

    Ultimate ½ Pint Substrate Jars (6-Pack)

    Fast shipping and a good price. Really don't want to get into making my own substrate and doing the sterilization. Great customer service and always responsive.

    Friendship WI 53934

    Premium Product!

    • Affordable
    • Quality
    Midwestgrowkits seems to have got it right! These jars are perfect for a beginner. They are very easy to use and colonize very nicely. I have found that halfway through it is smart to flip the jar over. It seems to finish off nicely that way. Definitely a great buy for the price though. Plan to buy many more!


    Substrate jars

    Order from Midwest every time they will have it on your front door within a couple of days. No problem. Any of my grow equipment will be bought from them in the future. Come to think about it I need a heap hose filter.

    Great business

    Midwest always gets my orders to me quickly and correctly. Emily is also a big help with questions. Glad I found Midwest grow.


    Awesome company

    Shipped fast and discreet. Very easy company to work with

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