Black Oyster Mushroom Fruiting Block - 5 lbs

Grow a deeply savory, gourmet mushroom with rich umami and elegant dark caps.
Black Oyster mushrooms are rich in nutrients. They are a popular choice for their strong umami flavor and meaty texture. They also grow well. With striking charcoal-to-slate caps and thick, satisfying stems, Black Oysters are a go-to mushroom for home cooks and chefs alike. Easy to grow, versatile in the kitchen, and beautiful to watch develop, this block delivers consistent harvests of one of the most practical and delicious gourmet mushrooms you can grow at home.

Product Details

• Weight: 5 lbs fully colonized block

• Expected Yield: ~1 lb per harvest

• Number of Harvests: 2–3 flushes

• Time to Grow: 7–14 days per flush

• Difficulty: Beginner friendly

• Best Environment: Use with your Lykyn Smart Grow Chamber

Why We Love Black Oyster Mushrooms

Black Oyster mushrooms strike the perfect balance between gourmet flavor and everyday usability. Their dark, sculptural caps grow in layered clusters, creating a beautiful yet understated visual display. More importantly, they’re one of the most satisfying mushrooms to cook with and eat.

• Deep Umami Flavor: Rich, savory, and mushroom-forward, Black Oysters deliver a bold umami taste that elevates any dish.

• Excellent Texture: Thick, meaty stems and tender caps hold up beautifully to sautéing, roasting, and stir-frying.

• Nutrient-Dense & Low Calorie: Black Oysters are low in calories and fat while being rich in fiber, vitamins, and minerals.

• Rich in Essential Nutrients: A great source of B vitamins (including niacin and riboflavin), potassium, phosphorus, and copper.

• Immune-Supporting Compounds: Contains beta-glucans and antioxidants that support immune function and overall wellness.

• Reliable & Forgiving: One of the most consistent oyster varieties to grow, making it ideal for beginners and repeat growers alike.

How to Grow Your Black Oysters

1. Setup: Fill your humidifier tank with distilled water and place the Black Oyster block inside your Lykyn Grow Chamber. Leave space in front of the block so mushrooms can grow freely, and be sure not to block the humidifier airflow.

2. Sterilize: Flame sterilize a razor or knife and allow it to cool completely.

3. Slice: Cut a small “X” on the side of the bag where you want the mushrooms to fruit.

4. Select: Place the chamber top back on and choose “Black Oyster” from the Lykyn App.

5. Relax: Your chamber automatically handles humidity and airflow—just watch your mushrooms come to life.

When It’s Ready to Harvest

Black Oysters are ready when:

• The caps are mostly open but still slightly curved at the edges.

• The color is deep gray to nearly black with a firm, full texture.

Harvest before the caps flatten completely for the best flavor and texture.

How to Harvest

Gently twist and pull the entire cluster from the base, or cut cleanly with a knife. Take care not to damage the remaining block so it can produce additional flushes.

How to Store

• Fresh: Store in a paper bag in the refrigerator.

• Shelf Life: 5–7 days fresh, or several months if dried or frozen.

• Tip: Avoid sealed plastic containers, which trap moisture and reduce freshness.

Cooking Tips

Black Oyster mushrooms are incredibly versatile and forgiving in the kitchen:

1. Dry sauté first to release excess moisture and concentrate flavor.

2. Add oil or butter once the pan is dry and cook until golden.

3. Finish with salt, garlic, soy sauce, or herbs to enhance their natural umami.

They’re perfect for ramen, stir-fries, risotto, pasta, grain bowls, or as a hearty mushroom-forward main ingredient.

Preparing for a Second or Third Flush

1. After harvesting, remove any leftover mushroom material from the surface of the block.

2. Re-soak the block in cold, clean water for 12–24 hours.

3. Drain thoroughly and return the block to your Lykyn Grow Chamber.

4. Select “Black Oyster” again in the app and begin the next growing cycle.

Reliable. Delicious. Effortless.
Black Oyster mushrooms deliver consistent harvests, rich flavor, and nutrient-dense meals—making them an essential addition to any home grow lineup with Lykyn.