Premium Bulk Mushroom Substrate Mix | Fully Pastuerized | Maximum Yield | for Dung & Grain Loving Mushrooms (5 LBS)

Excellent quality

I have made several rounds of the “good stuff” using this exact product. It’s easy. I’ve never had any contamination. Worth every penny. Making your own is such a hassle.

Looks perfect, doesnt have airport or injection port like grow bags do for all in one growing more just for mono tubs type of growing

no joke, i opened a bag of this up used half then rolled up the bag and threw it in a cupboard and forgot about it for at least 8 months. Found it looking fresh as the day i tossed it pasteurized it in my instantpot just to be safe and it is still going strong.

I used this along with their 5 grain spawn for my first few ever mushroom grows about a year ago and everything went great. No contamination and bountiful harvest.

I’ve had good production with this sub. Good moisture, low contam rate, myc seems to like it. Kind of $$$ so I save it for new or challenging fungi.

Perfect

I purchased 12 of these substrate bags. After success with my first 2 bags (one monotub) during warmer weather, the subsequent 5 attempts during cold weather invariably failed. Moreover, 3 of the bags arrived broken and were therefore contaminated right off the bat. The substrate has a tendency to dry out, particularly in dry Midwestern winters or wherever gas furnaces are used during the winter. Mushrooms are extremely sensitive to moisture and humidity, and when substrate dries out, mycelia quickly stop growing. When going the route of purchasing pasteurized, pre-hydrated substrate, the two options for growers in dry environments then become to either open the monotub and manually hydrate, which is certainly not ideal because it introduces potential contaminants (and defeats the purpose of purchasing relatively expensive pasteurized substrate bags), or to leave it alone, which from my experience in ~35% ambient humidity, failed 5 times. Invariably mycelia stopped growing and mold took over once the substrate dried out. A far better approach would be to make one's own CVG substrate. It's far less expensive and simple. I'm convinced enough from having 5 different monotubs dry out at the same time of year to post these words of warning and advice to students of mycology. Unfortunately, a one-size-fits-all approach to pre-hydrated substrate is doomed to fail in dry environments if the growing conditions are not adapted to ensure that mycelia have what they need to grow.