King Trumpet Mushroom Grow Kit

What Makes King Trumpet Mushrooms Special:
King Trumpet mushrooms (Pleurotus eryngii), also known as King Oyster mushrooms, stand out for their thick, meaty stems, mild flavor, and exceptional cooking performance. Unlike many oyster mushrooms that grow in clusters, King Trumpets develop as large individual mushrooms, giving them a dense texture that holds up well to slicing, grilling, roasting, and pan-searing.

One of the biggest reasons growers and chefs love King Trumpets is their versatility in the kitchen. The firm stems absorb marinades, brown evenly, and maintain their shape when cooked, making them a popular plant-based alternative to meat. Their flavor is subtly savory with a natural umami depth that pairs well with a wide range of dishes.

Why do mushroom grow love King Trumpet?
King Trumpet mushrooms are unique in that they prefer cooler temperatures and steady fresh air, which encourages thicker stems and slower, more controlled growth. This makes them an excellent choice for indoor growing, especially for those who want a gourmet mushroom with a more structured growth habit and a longer harvest window.

Why RMS King Trumpet Blocks Are Different:
Our blocks are cultivated using premium hardwood substrate specifically selected for this particular mushrooms. Each block ships fully colonized at peak readiness for fast, reliable fruiting. Since they prefer cooler temperatures these mushrooms typically take 2-3 weeks to mature once they start to fruit, making them perfect for fall and winter growing when other varieties slow down.

Instructions

Getting Started:

1. Before opening the bag, gently massage the top surface of the grow block through the plastic. This helps loosen the mycelium and encourages even pin formation right where the mushrooms will fruit.
2. Place the unopened block in its growing location and allow the mushrooms to begin pinning toward the top. Once you see pins forming through the plastic, it’s time to open the grow bag.
3. Using a clean knife, cut the top of the bag just below the seal. This creates a built-in microclimate that helps the mushrooms develop thick stems and well-formed caps. As the mushrooms grow, you can gradually roll the bag down to about 5 inches above the substrate layer to increase fresh air while still maintaining humidity.

Ideal Conditions

• Temperature: 50–55°F
• Humidity: 85-90%
• Fresh Air Exchange: Moderate
• Fruiting Method: Indoors. Bags in growth chamber, monotub

Daily Care (The RMS Way):

1. Keep the bag intact until pins form. This helps maintain a stable, humid microclimate during the most sensitive stage
2. Watch for pins. Pins typically start on the top surface 7–14 days after setup/opening (depending on conditions).
3. When pins are 1/2–1 inch tall:
   Using a clean knife or scissors, cut a 2–3 inch opening at the very top of the bag, just below the heat seal. This protects humidity while allowing better airflow as mushrooms size up. Only begin light misting at this stage.
4. Monitor closely and adjust airflow if pinning is slow. Ensure consistent Fresh Air Exchange (FAE) in the fruiting chamber. Lower CO₂ levels are crucial to initiate pinning. Monitor closely and adjust airflow if pinning is slow.

Harvesting for Best Results:
Pick when mushrooms are fully developed but before they over-mature. Gently twist at the base, or cut cleanly with a knife where the stem meets the block.

Single-fruiting only:
King Trumpet blocks are often considered “single-fruiting” and can be more contamination-prone after the first harvest, so a second flush is not reliably expected