When is the right time to harvest mushrooms?

The key to harvesting is keeping a close eye on the veil (the thin membrane on the underside of the cap). You don’t want the veil to break and release spores into the substrate, as this can result in subpar flushes. Therefore, pick the shrooms just before the veil tears (it will darken and sag). If you notice the veil darkening, don’t wait—it’s generally better (and safer) to harvest early than late.