Mushroom Monotub Starter Kit – 2 lb Rye Grain Spawn, 4.5 lb Substrate & Tub

Step up to bulk growing. This monotub kit includes sterilized rye grain spawn, a pre-hydrated bulk substrate and the tub itself, so you can grow bigger harvests of a wide range of mushroom species at home.

What's Included

• 2 × 1 lb sterilized rye grain spawn bags with 0.2 µm filter, injection port, sterile indicator strip and batch tracking
• 4.5 lb pasteurized CVG bulk substrate (coco coir, vermiculite, gypsum)
• 16 qt monotub (unmodified; no drilling needed)
• 2 glove packs (nitrile gloves and alcohol prep pads), step-by-step instructions and a FunGuy sticker

Live mushroom culture is sold separately. The grain bags are ready for your own liquid culture.

How It Works

1. Inoculate: Wipe each injection port with a prep pad and inject 3–5 cc of liquid culture per bag.
2. Colonize the grain: Keep the bags dark at 75–80°F. Growth usually appears in 7–14 days.
3. Spawn to bulk: When the grain is fully white, mix it with the substrate in the clean tub and level the surface.
4. Colonize the tub: Keep the lid on and the tub dark until the surface is covered in white mycelium.
5. Fruit: Crack the lid for fresh air exchange and give the tub indirect light. Open the lid to fan it, and mist only when the top or sides look dry.
6. Harvest: Pick before the caps flatten, rehydrate, and repeat for more flushes.

Timeline

• First visible growth on the grain: 7–14 days after inoculation
• First harvest: about 3–5 weeks after inoculation, depending on species and conditions
• Up to 3 flushes per kit

Ideal Conditions

• Colonization: 75–80°F, in the dark
• Fruiting: 65–75°F, indirect light, steady fresh air, high humidity

Yield Expectations

Yield varies with species, culture and conditions. Expect up to 3 flushes from one tub; rehydrate between flushes.

FAQ

Which mushrooms can I grow? Works with a wide range of mushroom species. The coco coir substrate isn't ideal for lion's mane or shiitake, which prefer hardwood sawdust.

Is a culture included? No. Use about 3–5 cc of liquid culture per grain bag.

Do I need a pressure cooker? No. The grain is sterilized and the substrate is pasteurized and ready to use.

How long can I store the kit? Use it within 2 weeks. Un-inoculated bags keep up to 4 weeks in a cool, dark place.

Monotub or all-in-one bag? All-in-one bags are the simplest. A monotub gives a larger surface area and bigger flushes.

Coming soon: pre-inoculated Blue Oyster grow kits, with no culture needed. Check back or join our email list to hear when they launch.

100% Success Coverage

Every FunGuy kit is made in our Rhode Island lab and backed by our 100% Success Coverage for 30 days. If your kit arrives contaminated, send us a photo and we'll replace it free of charge.

Full walkthrough: Growing Guides.