Organic Blue Oyster Mushroom Grain spawn

🍄 GRAIN SPAWN : Pleurotus ostreatus, a staple variety for mushroom cultivation.
🌱 VERSATILITY: Works with a wide range of growing media, such as straw, sawdust, and many others, offering growers great flexibility.
💪 A HARDY AND HIGH-YIELDING VARIETY: Pleurotus ostreatus is known for its hardiness and exceptional productivity, ensuring abundant harvests.
🍽️ EXCELLENT FLAVOR: Prized for its delicate taste, this mushroom adds a unique touch to your dishes.
🌍 LOCALLY GROWN AND ORGANIC: Certified "BE-BIO-01" by Certisys.

€13.90

Volume

2.7 L (±1.5 kg)
5.4 L (±3 kg)

- +

Categories:
Outdoor Cultivation Indoor Cultivation MycoMaterials Mycelium on grains

Delivery time:

Approx. 2 weeks
(usually in stock). See all our delivery times

Oyster mushroom "Blue Oyster" – Pleurotus ostreatus KB1 (Columbinus)

A highly productive and easy-to-cultivate mycelium, suitable for a variety of substrates (straw, sawdust, logs). The strain produces beautiful caps and can take on bluish hues at low temperatures.

Native to the temperate forests of Europe, the oyster mushroom naturally on dead tree trunks and branches. It is most commonly found in the fall and late winter. Today, it is one of the most widely cultivated mushrooms in the world, prized for its flavor and ease of cultivation.

Characteristics of the strain

Caps: 5 to 15 cm
Color: light gray to dark brown (depending on conditions)
Characteristic: bluish hues at 10–15°C at the start of fruiting
Texture: more tender than many oyster mushrooms, with thick stems
Advantage: excellent productivity and good shelf life

❄️ Storage: Store in the refrigerator (1–4°C) and use within one month of receipt.

👉 See also: How to use our mycelium

Our Commitment to Quality

Mycelia produced under laboratory conditions (varietal purity)
100% organic production
BE-BIO-01 Certification (CERTISYS)

🌱 Growing conditions

oyster mushroom be grown year-round. Ideal temperature: 12–20°C. Maintain high humidity from the start of cultivation until primordia appear.

Mycosphere Tip: To trigger a good fruiting, start with a cooler phase at 10–15°C and 95–100% humidity until primordia form, then maintain humidity at around 85–95% during growth.

harvest Pick the clusters by hand, gently twisting them, before the edges of the caps turn brown and curl up. Remove any debris and maintain humidity until the next flush.

🛠️ Recommended growing media

For indoor cultivation: pasteurized straw, pasteurized sawdust, or other lignocellulosic materials.

For a simple and consistent result, we recommend:

Organic straw pellets (add 1 teaspoon of lime and 2 liters of cold water per kilogram of pellets)
Sawdust-based substrate for wood-eating species

For outdoor cultivation: logs or mulch. For cultivation on logs:

Mycelium on logs (log cultivation)

📊 Growing conditions

Seed rate: 5 to 10% seeds per unit of moist substrate.

Phase	Temperature	Duration	Humidity	Light	CO₂	Fresh air
Incubation	20–24°C	2–3 weeks	-	-	-	-
Formation of primordial cells	10–15°C	4–7 days	95–100%	600–1,000 lux	500–800 ppm	4 to 8 flights per hour
fruiting	10–20°C (ideally 15°C)	5–10 days	85–95%	600–1,000 lux	500–800 ppm	4 to 8 flights per hour

📚 Estimated data from “Growing Gourmet and Medicinal Mushrooms” (P. Stamets). Your results may vary depending on the substrate and growing conditions.

📈 Productivity

On average: 200 to 350 g of fresh mushrooms per 1 kg of moist substrate, over 2 to 3 harvests.

FAQ – oyster mushroom (KB1)

What type of growing medium should I use?

The oyster mushroom is versatile: it can be grown on pasteurized straw, pasteurized sawdust, and other lignocellulosic materials. For simple and consistent results, organic straw pellets work very well.

How much does it produce?

On average, allow 200 to 350 grams of fresh mushrooms per kilogram of moist substrate, over 2 to 3 harvests.

What is the ideal temperature?

For best results: 12–20°C in general, with a cooler initial phase at 10–15°C to trigger fruiting.

Do we need some light?

Yes, soft lighting helps produce beautiful caps: about 600–1,000 lux during the growth and fruiting stages.

What is the vaccination rate?

We recommend using 5 to 10% mycelium (grains) relative to the weight of the moist substrate.

Received

Received it on time, just as promised. The Mycelium is high-quality and has a beautiful, pure white color. I set it up as recommended...to be continued.

very good

Great, thanks

great

It arrived in perfect condition and is easy to use

Perfect

Perfect for beginners, the mycelium grows vigorously and is very forgiving

Great delivery and quality! Works great

Great delivery and quality!
Works great, even for a beginner!

1 2 3

Reviews in Other Languages

Great content

Great content—thank you and well done!

“Vigorous, high-quality mycelium with extremely rapid colonization”

I bought the Grain spawn Gray Grain spawn (5.4 L / ±3 kg), and I was impressed by the quality from day one. The spawn was completely white, fresh, and had a clean smell—a sign of healthy, active mycelium.
When I mixed it with my substrate, colonization was very fast and even, with no contaminated areas. Within a few days, I could already see it growing vigorously.

The yield was also excellent: it produced good primordia, and the clusters were large, with a pleasant aroma and firm texture.
Perfect for those looking for reliable, organic, and potent mycelium to start or expand their oyster mushroom cultivation.

Highly recommended for its purity, potency, and consistent results.