Sep, Oct, Nov
Take a clay pot and pop a small clump of moss from your garden over the drainage hole.
Loosely fill the pot with hay so that the moss drops when the pot is turned over, allowing access for the bee.
Choose a warm sheltered spot, such as the foot of a hedge. Scrape away a little soil, enough to bury half the pot. Turn the pot upside down into the hole and push the soil back around it.