Some mushrooms prefer to grow in an outdoor bed in your garden. These outdoor beds are usually made from either fresh woodchips or compost.

The main species grown on woodchip beds is King Stropharia (Stropharia rugoso-annulata) and the two main species grown on compost are button / field mushrooms (Agaricus bisporous) or Shaggy ink cap mushrooms (Coprinus comatus).

The process is fairly simple. Firstly, you’ll need some spawn. Grain or sawdust spawn works well for these species. 

Approximately 1kg of spawn is required per 1m x 1m x 10cm deep patch of these mushrooms.

A bed can be prepared by digging a shallow hole (5-10cm deep) and filling it with fresh woodchips or fresh compost according to species. This substrate layer should be 10-30cm deep. Where space is an issue, this same process can be done in the likes of a fish crate / plastic storage bin (black or opaque) with drain holes cut in the bottom. Or even a large flower pot will do the job as well.

Fill the patch with the substrate and thouroughly mix in the spawn.

After this, simply make sure that the patch is kept damp. Water it with the garden hose during dry spells. After a few months to a year, you should notice some good crops of mushrooms pop up when conditions are suitable!