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 134 Reviews:

    Great experience

    • Sterile
    • like the size
    • No cons
    I a returning customer of Midwest Grow Kits for about two years, and very happy with the products and the customer services.

    These jars do a great job, I keep coming back for more.

    Used these since day 1, seven years and never failed

    First and only one i use. Simply cant get better results with anything else.

    These work great

    • Produce faster
    • Lots of steps
    These work great although I am more of a spawn bag lover now

    Great Product

    You can’t go wrong with these. They are Perfect. The only downside is one broke in shipment.



    Came in very quick. Seem to be working great

    You May Also Like

    Mega Mushroom Grow Kit

    Mega Mushroom Growing & Incubator Kit

    Price: $137.00

    Ultimate Mushroom Growing Kit

    Ultimate Mushroom Growing & Incubator kit

    Price: $97.00

    Simple Mushroom Grow Kit

    Simple Mushroom Grow Kit

    Price: $55.00

    The Mushroom Ecosphere greenhouse,grow mushrooms,grow tent

    The Mushroom Ecosphere

    Price: $209.00