3.5 lb. Mystery King Oyster Mushroom Spawn


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Mystery King Oyster Mushroom Spawn: Fast Growth

Note: Processing time for mushroom spawn is 4-weeks

Species & Variety: Pleurotus ostreatus

Grow your own mushrooms commercially – with our Mystery King Oyster Mushroom Spawn. Use this 5 lb. bag of colonized rye grain spawn to inoculate bulk mushroom substrates. ( hardwood, straw, etc.)

  • 3.5 lb bag of Mystery King Oyster Mushroom Spawn
  • Inoculates 150-200 lbs. of Bulk Substrate (15 – 20 x 10 lb. bags)
  • Made w/ Organic Rye Berries
  • Free of Contaminants
  • Slower-Growing Variety
  • Grow King Oysters Easily


Mystery King Oyster Mushroom Characteristics


  • Neutral Flavour
  • Low Speed Growth
  • High Yielding
  • Extremely Large & Tender Caps and Stems
  • Fruiting Time = 7 days


Order Processing Time


  • 4-Weeks


When you place an order with us – we begin to grow your mushroom grains. During this time we test for growing speed and check for contamination. Ensuring that you receive a commercial-ready product with a high success rate.

  • CAD
  • USD
Product Information

Mystery King Oyster Mushroom Spawn For cultivation

Our mystery king oyster mushroom spawn is created in our clean room facilities in Brantford, Ontario. We ship our spawn anywhere in the US or Canada.

When buying spawn from us, you can expect:

  • Sterilized mushroom spawn (free of contamination)
  • Ready To Inoculate
  • Made With Organic Materials
  • Commercial High-Yielding Strains

How Long Does It Take To Ship?

Spawn customers should allow 4-weeks for their spawn order to be delivered. In some cases we will have the spawn in-stock and ship it immediately. Most of the time, however, the 4-week wait will apply.

Why Does It Take 4-Weeks?

To avoid shipping you out-of-date spawn we make your orders on-demand. We also test all spawn bags for vigour to ensure the final product is contaminant-free.

Planning for Commercial Growers

When sourcing spawn it’s a common occurrence in the industry – and necessary for your business to plan ahead. Securing your grain spawn for growing is essential to running a successful mushroom operation.

  • Order 4-weeks before you need the product
  • Subscribe for regular monthly deliveries
  • Avoid production delays
  • No Need for expensive equipment

Using Your Spawn

If you need more information about how to use your Mystery King Oyster Mushroom Spawn, we have written a guide on just that!

Take a minute to read this informative guide. Click here to read the guide.

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mystery king oyster mushroom spawn

3.5 lb. Mystery King Oyster Mushroom Spawn

  • CAD
  • USD