Organic White Oyster Mushroom Grain spawn
- 🍄 MYCELIUM ON WHITE OYSTER MUSHROOM SPORES: Pleurotus ostreatus, a vigorous variety that is very easy to grow.
- 🌱 EASY AND VERSATILE: Works with a variety of substrates, such as straw, sawdust, logs, or mulch.
- 💪 ROBUST AND PRODUCTIVE: Fast-growing mycelium that is reliable and generally resistant to contamination.
- ☀️ INDOOR OR OUTDOOR GROWING: Suitable for growing in bags, on logs, or in mulch beds in the vegetable garden.
- 🌍 LOCALLY GROWN AND ORGANIC: Certified BE-BIO-01 by Certisys.
To grow your oyster mushrooms:
White oyster mushroom – Pleurotus ostreatus
The white oyster mushroom is one of the easiest varieties to grow. Its mycelium is vigorous, adapts to a wide variety of substrates, and is generally resistant to contamination.
It can be grown indoors or outdoors, for example on straw, sawdust, logs, or mulch in the vegetable garden.
This variety produces large white caps, up to 15 to 20 cm in diameter, especially during the second harvest.
The white oyster mushroom is prized for its ease of cultivation, rapid growth, and high yield. When grown indoors, it requires good ventilation to prevent the stems from becoming too long and to encourage the caps to open.
🔍 Note: This variety is sometimes called or confused with the “elm oyster mushroom.” The true elm oyster mushroom is generally Hypsizygus ulmarius, a different species.
The variety offered here is a white Pleurotus ostreatus, which is generally easier to grow and more productive in indoor cultivation.
❄️ Storing the mycelium: Store in the refrigerator, ideally between 1 and 4°C.
For best results, use it within one month of receipt.
👉 See also: How to use our mycelium
Our Commitment to Quality
We produce our mycelium under laboratory conditions to ensure varietal purity and optimal quality.
Our mycelia are organically produced and certified BE-BIO-01 by Certisys under the Belgian Organic Agriculture program.
🌱 Growing conditions
White oyster mushrooms can be grown indoors year-round. They are fairly hardy, but they are particularly sensitive to CO₂ levels.
When growing indoors, good ventilation is necessary to keep the plants compact and encourage the growth of the flower heads.
Tip from La Mycosphère: If the stems grow long but the caps remain small, increase the supply of fresh air. This is often a sign of excess CO₂.
Outdoors, seeds should ideally be sown in early spring for a harvest summer or fall. In case of drought, it is important to keep the soil moist.
🛠️ Recommended growing media
For indoor growing
Use pasteurized straw, pasteurized wood shavings, or other lignocellulosic materials.
For a simple and consistent result, we recommend:
- Organic straw pellets: Add about 1 teaspoon of lime and 2 liters of cold water per kilogram of pellets.
- Sawdust-based substrate: suitable for wood-eating species and very convenient for regular cultivation.
Outdoor cultivation
White oyster mushrooms can also be grown on logs, straw, or plant material rich in lignin and cellulose. The substrate must remain moist, especially during dry periods.
📊 Growing conditions
Inoculation: 5 to 10% grain mycelium based on the weight of the moist substrate. A higher dose, up to 20%, can accelerate colonization.
| Phase | Temperature | Duration | Humidity | Light | CO₂ | Fresh air |
|---|---|---|---|---|---|---|
| Incubation | 20–24°C | 2–3 weeks | - | - | - | - |
| Formation of primordial cells | 10–20°C | 2–4 days | 95–100% | 500–1,000 lux | 500–800 ppm | 4 to 8 cubic feet per hour |
| fruiting | 10–25°C | 4–5 days | 85–95% | 400–600 lux | 500–800 ppm | 4 to 8 cubic feet per hour |
📚 Estimated data from *Growing Gourmet and Medicinal Mushrooms* by Paul Stamets. Results may vary depending on the strain, substrate, humidity, ventilation, and growing conditions.
📈 Productivity
On average, use 150 to 250 grams of fresh mushrooms per kilogram of moist substrate, depending on the substrate and growing conditions.
FAQ – White Oyster Mushroom
Is the white oyster mushroom easy to grow?
Yes, it’s one of the easiest varieties to grow. It’s vigorous, fast-growing, and adapts well to many growing media.
What type of growing medium should I use?
Pasteurized straw works very well, as does pasteurized wood shavings. Organic straw pellets are an easy way to get started.
Why do feet get longer?
This is usually caused by too much CO₂ or a lack of fresh air. Increase ventilation to produce wider caps and shorter stems.
Can it be grown outdoors?
Yes, it can be grown on mulch, logs, or plant matter. When growing outdoors, it is especially important to keep the growing medium moist.
What inoculation rate should be used?
We generally recommend using 5 to 10% grain-based mycelium relative to the weight of the moist substrate. A higher dose may speed up colonization.
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