CONTRARY to popular belief shiitake, like most mushrooms, need light to grow. They also need a reasonable amount of humidity and temperature to grow in abundance. After opening the bags, it usually takes about a week to produce and harvest the mushrooms from a batch of fruiting blocks.
Maesyffin Mushrooms - Organic Shiitake Mushrooms Wales - The True Taste
   
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Maesyffin Mushrooms' shiitake are grown organically in Wales on
woodchip and sawdust substrates produced using locally-sourced oak.

SHIITAKE CULTIVATION
Shiitake (Japanese for 'Oak Mushroom') have been cultivated on oak logs for centuries, but it can be an unpredictable business - usually taking more than a year before fruiting, and then only in spring and autumn if the logs are kept in natural conditions outdoors.

Fortunately, shiitake can be grown all year round on artificial 'logs' made from wood chippings and sawdust.

The oak sawdust comes from clean mill waste and planings, and the chippings are made from small oak branches.

From inoculation to fruiting takes 8-10 weeks and a fruiting block can produce more than one flush of mushrooms.

Once spent, the block may be broken up and used as a substrate for growing other mushrooms, composted, or burned in wood burners or bio-mass boilers to provide heat.

Soil Association