Blue Oyster Mushroom Grow Kit

Striking steel-blue mushrooms, grown at home this winter.

This kit is a fully colonized, ready-to-fruit block of Blue Oyster (a blue strain of Pleurotus ostreatus). Cut it open, mist it a couple of times a day, and watch clusters of blue-gray caps appear, usually within about two weeks. Blue Oyster likes cooler rooms, and the cooler it is, the bluer the caps, so it's an ideal winter grow for a basement, mudroom, or cool kitchen.

Three ways to order:

• Made fresh to order (ships in 3–4 weeks): We grow your block after you order, so it arrives at peak vigor.
• Holiday gift (ships week of Dec 14): Reserved from our holiday batch and timed to arrive just before the holidays, fresh and ready to open. Limited quantity.
• Ready to ship (ships in 1–3 days): When we have blocks on hand. If it shows sold out, choose one of the options above.

Includes WeMush tracking: Every kit ships with a QR code linked to WeMush, our cultivation tracking platform. Scan it to log your harvests and follow your grow.

What's in the box

• A fully colonized Blue Oyster fruiting block in a filter patch grow bag
• Step-by-step growing instructions

You'll need: A spray bottle and a cool, bright spot out of direct sunlight.

How it works

1. Open within a week or two of arrival. The block is alive and ready to go.
2. Cut an X about 2 inches wide in the front of the bag.
3. Place it where there's enough indirect light to read by, out of direct sun and away from heaters and drafts. Not in a cupboard.
4. Mist 2–3 times a day, aiming at the air around the opening to keep it humid. In dry winter air, loosely tent the kit with a clear plastic bag.
5. Harvest in about 1–2 weeks, as the caps go from domed to nearly flat, while the edges still curl slightly down. Twist the whole cluster off at the base.
6. Grow again. Keep misting and most blocks produce a second, smaller flush in about 2–3 weeks.

Good to know

• Ideal conditions: About 50–65°F (10–18°C). It still grows in a warmer room, though caps come in paler.
• Yellow-orange droplets on a Blue Oyster block are normal.
• Long stems, small caps? The kit wants more fresh air or more light.
• Fine white fuzz is usually the mushroom's own mycelium. If a white patch turns green, or a fast cottony web spreads over the mushrooms, that's mold; contact us.
• Spores: Oysters drop a lot of spores as they mature, so harvest on time and don't grow them in a bedroom.
• Freshness matters: If you're giving it as a gift, choose the holiday option so it arrives close to the big day.

Our guarantee: If your kit arrives damaged or doesn't produce when the instructions are followed, contact us and we'll make it right.