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    Grey Oyster Mushroom Grow Kit

    $29.99
    $24.95
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    Grey Oyster Ready-to-Fruit Mushroom Grow Kit

    Grow classic Grey Oyster mushrooms at home with a fully colonized ready-to-fruit block from Redwood Mushroom Supply. Grey Oyster is a forgiving, fast-growing variety with a mild savory flavor and substantial texture.

    Keep the block inside its plastic grow bag and fruit through one clean side X or 3–4 inch slit. Grey Oyster performs best around 60–70°F with high humidity, indirect light, and plenty of fresh air. Long stems with small caps usually mean the mushrooms need more fresh air—not more water.

    Need setup instructions? View our Grey Oyster Grow Kit Guide for countertop setup, automated grow tent setup, harvest timing, troubleshooting, and second-flush tips.

    Why Grey Oyster Is a Grower Favorite

    🍄 Forgiving Oyster Variety — Grey Oyster adapts to cooler indoor conditions better than Pink Oyster.
    🌬 Fresh-Air Responsive — Good fresh-air exchange supports broad caps and balanced clusters.
    🌱 Fully Colonized & Ready to Fruit — No substrate preparation or incubation is required.
    🍽 Classic Gourmet Flavor — Mild, savory flavor and substantial texture work well in stir-fries, pasta, soups, roasting, and sautéing.
    ♻️ Additional Flush Potential — A healthy block may produce another flush after harvest with proper rest and rehydration.

    Species: Grey Oyster (Pleurotus ostreatus)
    Block Weight: ~5 Pounds
    Substrate: Hardwood-based supplemented fruiting block
    Fruiting Style: Side-fruiting through one clean X or 3–4 inch slit
    Best Temperature: Roughly 60–70°F
    Humidity: High humidity; 85–95% is ideal in a grow tent
    Fresh Air: High fresh-air exchange; avoid sealed or stale air
    Expected Timing: Pins may appear within several days to 2 weeks; once pins form, clusters can develop quickly
    Difficulty: Beginner

    Product Details

    Grow Grey Oyster Mushrooms at Home

    Grey Oyster is a classic side-fruiting oyster mushroom that performs well in cool-to-moderate indoor conditions. Keep the block inside the grow bag and fruit from one side opening.

    For countertop growing, use a loose DIY humidity tent if the room is dry. Mist the inside walls of the humidity tent and lightly around the cut area, while giving the mushrooms plenty of fresh air.

    Fresh Air Matters

    Long stems with small caps are a common sign of insufficient fresh air. Increase gentle fresh-air exchange rather than simply increasing misting.

    Harvest

    Harvest before the caps flatten completely or curl strongly upward. Remove the full cluster at the base and clean away leftover stem tissue.

    Instructions

    How to Use Your Grey Oyster Grow Kit

    1. Remove the grow kit from the RMS cardboard shipping box. Keep the block inside its plastic grow bag.
    2. Wash your hands or wear clean gloves. Choose one broad side and make one clean X-shaped cut or one 3–4 inch slit.
    3. For countertop growing, place the block on a plate or tray and loosely cover it with a clean plastic bag as a DIY humidity tent. Leave the bottom loose or add several small holes.
    4. Mist the inside walls of the humidity tent and lightly around the cut area 1–2 times per day. Avoid directly soaking pins or mushroom clusters.
    5. Provide plenty of fresh air. If stems become long and caps stay small, increase gentle air exchange.
    6. Aim for roughly 60–70°F, indirect light, and high humidity.
    7. Harvest before the caps flatten completely or curl strongly upward.

    Second Flush

    After harvest, remove leftover stem tissue and let the block recover in fruiting conditions. If the block becomes dry and light, rehydrate according to the updated grow guide before returning it to high humidity and fresh air. Later flushes are usually smaller.

    Specifications

    Species: Pleurotus ostreatus (Grey Oyster)
    Block Weight: 5 lbs fully colonized substrate
    Substrate Composition: Premium hardwood sawdust blend
    Growing Time: 7-10 days to first pins, 3-5 days from pins to harvest
    Temperature Range: 50-80°F (ideal: 60-70°F)
    Humidity Needs: 85-95% (achieved through regular misting or humidity tent)
    Light Requirements: Indirect natural or artificial light (mushrooms need light to develop properly)
    Expected Harvests: 2-3 flushes per block with proper care
    Total Yield: 1-2 lbs fresh mushrooms
    Shelf Life: Start growing within 2 weeks of receipt for best results

    Difficulty Level: Beginner-friendly—one of our most forgiving varieties
    Best For: Cooking, meat alternatives, beginners learning mushroom cultivation, year-round growing

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    Grey Oyster Mushroom Grow Kit

    $29.99
    $24.95