Premium Tan Oysters mushroom grain spawn – 100% colonised on locally sourced New Zealand grown wheat and ready to be mixed into your substrate for fruiting mushrooms. Spawn is ready to use as soon as it arrives.
 
Tan Oysters are a popular commercial strain of the classic Pleurotus ostreatus (the original "Pearl Oyster"). It produces attractive tan to light-brown caps (sometimes called Brown Oyster or Golden Tan Oyster), with white gills and stems. It’s a reliable, vigorous, wood-loving side-fruiter and one of the most commonly cultivated oyster strains globally.
 
Unique Culture Information
 
Scientific name: Pleurotus ostreatus
Flavour & texture: The flavour is mild, earthy, and slightly anise-like, very similar to standard grey/blue oysters but with warmer tan tones.
Spawn Storage: If you cannot use your spawn right away you can store it for up to 4 months in the fridge. Spawn vitality cannot be guaranteed with fridge storage.
Difficulty: Easy - Beginner friendly.
Growth speed: Very fast - oyster mushrooms are aggressive growers, perfect for beginners.
Incubation time & temperature: 9-12 days @ 23-25°C
Fruiting temperature: 15°-25°C
Inoculation to Harvest: 15-19 days
Yield: Very good with quality fruit bodies.
CO2 Tolerance: Good - fruits best below 1000ppm
Ideal Fruiting Humidity: 80-90%
Native status: Non native - Imported
Recommended Fruiting Substrates: Cereal Straw (Wheat or Barley), Masters Mix (50% wood pellets / 50% soy hulls) or 20% Bran + 80% Pine Fire Pellets.
Substrate Preparation Method: Oyster grow well on both Heat or Hydrated lime pasteurised substrate as well as 15PSI pressure sterilised substrate in filter patch bags.
Growing Style:  Oyster mushrooms grow well in >> filter patch bags, >> straw poly tube bags and buckets.
 
Receiving Spawn:
Upon receiving your spawn it is ideal to take it out of the box within a day or two, stand the top of the bag up so the filter patch is exposed and the spawn can breath. Keep in a room temperature (10-25°C) place out of direct sunlight until used.
 
Beginners / first-time growers:
If you’ve never used grain spawn before (or you’re not sure how to mix it into substrate), start with our  >> Easy 5 Step Tan Oyster Grow Kit instead.
These kits include grain spawn and bulk substrate with detailed step-by-step instructions that teach you exactly how to use spawn to grow mushrooms. It’s the easiest way to learn the whole process hands-on.
 
All spawn and culture work is done in-house in our own laboratory.
 
All spawn cultures we offer have been sourced within NZ or imported under MPI import permit with permission to on-sell.
 
Customers who buy Mushroom Grain Spawn often also purchase:
 
>> DIY 5 Step Tan Oyster Grow Kit (Makes 7kg kit)
 
>> Sterilised Grain for growing mushrooms
 
Always identify any mushroom before consuming!