Dr. Myc™ MGP Pure – Mushroom Growth Enhancer

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Enhance mushroom growth with MGP, “mushroom growth promotion!” – MGP Pure contains microbes that help support enhanced mushroom growth and colonization in your monotub grow!


Free shipping available for orders $100 or more. Manufacturer Direct and special order items may require extra charges. See the Docs & Downloads section for product labels and other important information. Questions? Contact us!

Product Features List
  • Decrease time to pinset by 5 – 15 days.
  • Increase fruit size.
  • Increase net harvest weight.
  • Improve additional flush harvest weights.

Each pack of MGP products contains microbes selected specifically for their growth promoting properties.

MGP Pure contains a blend of microbes designed to promote fruiting and improve harvest yields.

MGP Pure has a number of benefits when applied to bulk substrate, including decreased time to pinset, increased fruit size, and increased net harvest weight.

The MGP Line is cost effective and easy to use, with each 10g pack making enough ready-to-use spray to treat approximately 20 monotubs or 40 grow bags.


Please select a variation to see its technical specifications


  1. Add 2 grams of MGP Pure or MGP Plus per 1L of non-chlorinated water (RO or Distilled is best) and add to a sprayer bottle.
  2. Mist colonized grain spawn directly  when mixing spawn and bulk substrate material, and then mix your grain and substrate evenly. Avoid spraying substrate directly where possible, and do not overapply – usage rate is 1 “spray” per pound of substrate used. 
  3. Apply once weekly if additional treatments are needed after pinset and fruiting have begun. 
  4. Store extra mix in the refrigerator and uUse the contents of the bottle within 6 months for best results.

ALTERNATIVE DRY USE: To use dry, add 1G per 2.5 Gallons of water to the grain soak and mix with grain/water.

When doing multiple flushes, MGP Pure can be used as a dunk additive for your colonized cakes between flushes, at a rate of .25 grams per block being dunked.

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