Shiitake Grow Kit Instructions

Shiitake requires a few more steps than oyster or lion's mane — please read through all the instructions before you begin. The extra attention upfront makes a real difference in your first flush. Questions? Read below and visit our FAQ page.

Before You Start

Shiitake is different from our other varieties Unlike oyster and lion's mane — where you cut into the bag and leave it on — shiitake blocks are fully unwrapped before fruiting. Shiitake needs full air exposure to develop properly. This also means the block dries out faster, so consistent misting is especially important.

1 Inspect your block. If you already see mushrooms beginning to emerge, skip to Step 4.
2 Refrigerate for 1–2 days. This cold shock triggers fruiting by mimicking a fall frost — the natural cue shiitake responds to in the wild. Don't skip this step.
3 Soak the block. After refrigerating, remove the block from its bag and submerge it in cold water for up to 24 hours. Use a pot or bucket. Don't soak longer than 24 hours — mycelium needs oxygen and can drown.

How to Set Up

4 Remove the block from the bag entirely and place it on a plate or in a shallow container.
5 Cover loosely. A clear bag with several holes, a terrarium, or a plastic bin all work — just make sure there's ample airflow. Tent the cover so it doesn't press against the block.
6 Find the right spot. Indirect light, temperatures between 60–75°F. Shiitake is more temperature-sensitive than oyster — it struggles above 75°F. Avoid direct sunlight and heating vents.
7 Mist at least 2–4 times daily. Because the bag is fully removed, the block dries out faster than other varieties. Keep the surface visibly moist. You can pool a small amount of water in the bottom of your container as a humidity reservoir. Avoid chlorinated tap water; rainwater is ideal, or boil and cool tap water if needed.

Emerging shiitake pins have tan to dark brown caps with lighter-colored stems. You'll typically see them within 1–2 weeks of setup.

How to Harvest

Harvest when caps have expanded and you can see the gills underneath, but while caps are still slightly rounded — before they flatten out completely.

Cut at the base of the stem with clean scissors or a knife, leaving as little stem behind as possible.
It's normal for the block to brown more as it matures — that's not contamination.
When in doubt, harvest a little early rather than late.

After Your First Flush

Once you've harvested, stop watering for two weeks. Then repeat the cold-shock and soak process to trigger a second flush.

A note from ten years of commercial growing: second indoor flushes on shiitake are harder to achieve than with oyster or lion's mane. Because the bag is fully removed, the block dries out faster and is more vulnerable to contamination between flushes. Your first flush will be your best. Total yield is typically 1–1.5 lbs.