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THE HASSLE-FREE, READY-TO-SPAWN SOLUTION FOR GROWING KING OYSTER AT HOME

King Oyster mushrooms have a rich culinary heritage in Asia and are prized for their thick, meaty texture and deep umami flavour. Originally cultivated in the Mediterranean region before spreading across East Asia, they are now a favourite in cuisines around the world.

King Oyster mushrooms are being studied for naturally occurring compounds such as ergothioneine and beta-glucans, which are associated with antioxidant activity. They also naturally contain fibre, B vitamins and minerals including potassium, calcium, iron and zinc.

Their firm texture makes them ideal for grilling, roasting, or slicing into plant-based “scallops”. King Oysters add depth and richness to a wide range of dishes, from comforting stews to refined gourmet meals.

Growing your own King Oyster mushrooms at home is simple with this King Oyster Mushroom Grain Spawn, produced by our trusted partners at Martian Mushrooms. Suitable for beginners and experienced growers alike, this spawn is designed to make cultivation straightforward and reliable.

The grain spawn arrives pre-colonised and ready to mix with your chosen substrate — no inoculation or waiting for grain to colonise. With the right conditions, you can expect thick, dense clusters of King Oyster mushrooms, ready to cook, dry or extract.

THE BENEFITS

🍄 Lab-tested, high-quality living grain spawn for inoculating substrates
🌱 Compatible with a wide range of substrates and growing methods
🧬 Specially selected strains optimised for yield, nutrient density and flavour
🗓️ Harvest mushrooms in as little as 3 weeks
🛡️ Backed by Martian Mushrooms’ guarantee – produces mushrooms or the spawn will be replaced
💷 Save money by growing your own mushrooms at home
🏡 Requires little space and is discreet with minimal odour
🧠 King Oyster mushrooms contain bioactive compounds such as beta-glucans

HOW TO USE

Inoculation
Mix the grain spawn with your substrate at roughly a 6:1 ratio, depending on substrate type. Hardwood or Masters Mix (hardwood + soy hulls) is recommended.

Top Fruiting
Once fully colonised, cut the top of the bag just below the seal to expose the block to fresh air.

Maintain Humidity
Mist the block two to three times daily or use a humidity tent.

Fruiting Environment
For best results, place the block in a fruiting chamber such as a MonoTub or Martha tent to help maintain ideal humidity and airflow.

A step-by-step online growing guide is available to help support successful results.

GROWING CONDITIONS

Substrate: Hardwood or 50/50 hardwood & soy hulls (Masters Mix), hydrated to ~60%

Temperature

• Colonisation: ~25°C (77°F)

• Fruiting: 16–21°C (61–70°F)

Humidity: Over 80%

Light

• Colonisation: Dark

• Fruiting: Indirect or ambient light

Fresh Air Exchange: Regular ventilation required

Cleanliness: Maintain a clean environment to reduce contamination

INGREDIENTS

This spawn is produced by Martian Mushrooms using high-quality grain and carefully controlled sterile processes to encourage fast colonisation and consistent performance.

WHAT’S INCLUDED

1.5kg King Oyster Mushroom Grain Spawn Bag

STORAGE

Use as soon as possible after delivery. If not using immediately, store in a refrigerator. When refrigerated, spawn should remain viable for up to 3 months.

IMPORTANT DISCLAIMER

This product is manufactured and supplied by Martian Mushrooms and sold by us as an authorised retail partner. All product specifications, performance claims and guarantees are provided by Martian Mushrooms. We do not manufacture this product ourselves. Any guarantees are fulfilled by Martian Mushrooms in accordance with their terms.