All year round
Scrub clean the base of your terracotta pot, then apply a generous layer of waterproof glue or tile adhesive to the base.
Place the saucer on the base of the pot, settling it into the glue. Leave it for 24 hours to ensure that the glue dries thoroughly.
Place the bath in a suitable spot, such as the edge of a border. Add stones so birds can perch to drink fresh, clean water.