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 129 Reviews:
    Over the Rainbow

    Return Customer

    • Name it.
    • None I can think of.
    I've bought from you guys several times before and, as usual, my order was shipped as fast as I could hope for. My other orders arrived in pristine condition; ripe and ready. I've not had a chance to inoculate these last jars (spore delay), but I have no doubt they will be every thing I could hope for. Because of the weight I get using your grain mix, I only order from you guys every couple of years, and it's really nice to be able to count on a consistently good product despite the time between orders. Viva ya'll.


    2nd Time Customer. No Need to Look Anywhere Else

    • Quality
    • price
    • speed
    • exceptional
    The first time I was purchasing the spawn Jars I had no idea who to get them from. I did my research and ended up choosing Midwest. The jars arrived with 3 of them broken...I am 100% sure this was the delivery guys fault as my neighbor said he saw the guy toss the box from the truck to my carport. I emailed Midwest anyway and they immediately sent me 3 more without any delay. It came time for me to purchase some more and I knew where to go this time. I made my order, and had them at my house in just a few days. My first time using them they exceeded my expectations and I am super excited to see how things go this time. This is a superior product from an awesome company.


    Everything from Midwest is Great!

    I have purchased many products from Midwest and my experience has always been great! The products are always high quality and arrive very quickly. And the customer support is the best! I have asked many questions (I'm new at this), and they have always been very responsive and helpful. I love working with them!


    6-pack jars

    I've recently ordered from other vendors with no signs of growth. The jars from Midwest were shipped quickly and packed tightly to prevent damage. I followed the instructions and my jars are colonizing at a good rate. I will def. order more products from this company.

    The only company I order from

    I’ve been ordering these from Midwest Grow Kits since I discovered them 4 years ago. I’ve never had any quality issues, and their prices including shipping have beat everyone else I’ve looked into. I’ll always order from them unless I decide to start making my own.

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