Premium Blue Oyster 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.
 
Known as Blue Oyster or Tree Oyster (Pleurotus ostreatus), these striking blue-grey mushrooms are an absolute powerhouse, aggressive grower with large dense mushrooms that produce very uniform growth, store and cook well. A well renowned commercial strain grown on a large scale throughout the USA. Offering world-class genetics for large harvests!
 
Unique Culture Information
 
Scientific name: Pleurotus ostreatus
Flavour & texture: A mild, sweet and earthy flavour with subtle anise like undertones. Tender, velvety, and meaty, sometimes with a "pull-apart" quality similar to chicken. Works well with slow cooked meals also.
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: 10-22°C Produces denser darker blues in colder fruiting conditions.
Inoculation to Harvest: 15-20 days.
Yield: Insanely high yields! One of the highest available.
CO2 Tolerance: Very 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. Works well as a side and top fruiter.
 
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 Oyster Grow Kits 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:
 
>> Blue Oyster Splash n Grow Kit (2kg) - ready made and easy
 
>> DIY Blue Oyster 5 step kit (7kg) - learn how to use spawn here first if you are a beginner
 
>> Sterilised Grain for growing mushrooms
 
Always identify any mushroom before consuming!