Step 5: Use the Humidity Tent — Boosting Moisture Retention

If you are growing mushrooms in a typical home environment — which usually runs between 30-50% relative humidity — a humidity tent is one of the most effective tools for maintaining the 85-95% humidity that mushrooms need to fruit properly. The humidity tent that comes with your MycoStock grow kit is a simple clear plastic cover that fits over the kit and traps moisture from your misting sessions, creating a humid microclimate around the developing mushrooms.

When to Use the Humidity Tent

We recommend using the humidity tent from the very beginning — right after you cut the bag in Step 1. The tent helps maintain consistent humidity during the critical primordia and pinning stages when developing mushrooms are most sensitive to drying out. Once mushrooms are well-established and growing rapidly, some growers remove the tent to provide more airflow, but keeping it on (with regular fanning) throughout the entire fruiting cycle works well too.

If you notice that pins are aborting (forming but then drying up and stopping growth), the humidity tent should be your first adjustment. Aborted pins are the number one sign of insufficient humidity, and the tent dramatically reduces moisture loss from the opening.

How to Use the Tent Properly

Place the humidity tent loosely over the grow kit so that it covers the cut opening and creates an enclosed space around it. The tent should not be sealed tightly — leave the bottom open or slightly lifted to allow some air exchange. When you mist, lift or remove the tent, spray the inside surfaces of the tent and the air around the opening (not directly on the pins), then replace the tent. After misting, fan gently for 15-30 seconds before putting the tent back to exchange stale CO2-rich air for fresh oxygen.

You should see condensation droplets forming on the inside of the tent within minutes of misting — this is a good sign that means humidity is being retained. If you never see condensation, you are not misting enough. If the inside of the tent is heavily fogged with water running down the sides, you may be misting too much — back off slightly and ensure proper air exchange during fanning.

DIY Humidity Tent Alternatives

If you have lost your humidity tent or want to try a different approach, several household items work well as substitutes. A large clear plastic storage bag draped loosely over the kit, a clear plastic storage container flipped upside down over the kit, or even a large glass bowl can serve as an effective humidity tent. The key requirements are: transparent (so light reaches the mushrooms), large enough to not touch the developing mushrooms, and not sealed airtight (some air exchange must occur).

For growers who want to scale beyond a single kit, a “shotgun fruiting chamber” — a large clear storage tote with rows of small holes drilled on all sides — provides an excellent humidity and airflow environment for multiple kits or blocks simultaneously. Line the bottom with damp perlite to maintain ambient humidity, place your kits inside, and mist and fan as usual. This setup handles humidity management more passively than a tent and is the natural next step as you expand your growing operation. Ready to harvest? Head to Step 6: Harvest, Eat, and Enjoy.