Blue Oyster (Pleurotus ostreatus) is one of the most forgiving mushrooms you can grow, which makes it a great first flush in your Flush. It pins readily, grows fast and rewards you with generous clusters.
What to expect
Young caps come through a deep blue-grey and soften to grey or tan as they mature, forming overlapping fan-shaped clusters on short stems. The flavour is mild and savoury with a gentle anise-and-seafood note, and the texture is tender and slightly meaty once cooked. They’re endlessly versatile in the kitchen — pan-fry until the edges crisp, fold through a stir-fry, or add body to soups and pasta.
Growing in your Flush
In Basic mode, choose the Blue Oyster preset and the cabinet holds 16°C, 88% humidity and around 650 ppm CO₂ for you. In Advanced mode, set those same targets from Set targets on the Home screen.
Blue Oyster pins in dense clusters, usually within 1 to 2 weeks of starting. Keep the fresh air moving — low CO₂ encourages broad, well-formed caps on short stems, while high CO₂ pushes long, leggy stems and small caps. A little indirect light helps them colour up and trigger pinning. Harvest just before the caps flatten right out and the edges start to turn upward.
Harvest & beyond
Pick the whole cluster at once by twisting gently at the base, rather than pulling individual mushrooms. Harvest before the caps flatten and release their spores, when they’re at their freshest and cleanest. Once you’ve picked, rest the block and keep the conditions steady — a healthy block will often give you a second flush a week or two later.