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Select a generous amount of nesting material - ideally an old mouse nest. Alternatively, cut up some dry straw, avoiding using any that's damp or rotting.
Make a cradle out of chicken wire to support and keep the nest dry. Fill the cradle with plenty of bedding material, but don't pack it too tightly.
Perforate an old piece of piping with drainage holes, using a needle. Push the pipe into the cradle so one end sits in the nest at a shallow angle, allowing the bees to climb in and out easily.
Dig a hole deep enough to submerge a third of the flower pot. The pot will be part-buried in the ground to create the cool, moist conditions bumblebees need.
Gently turn the pot upside down, holding the cradle, nest and pipe in place with your hand. Then sink the pot into the ground, ensuring there are no kinks in the entrance pipe.
Push loose soil up around the edge of the pot and pipe, leaving the pipe's tip poking out above the surface. Place the slate over the top to keep the nest dry.