When you receive your plants, pot them up and protect from frosts. Water well and keep in a bright, warm spot, watering again only when the soil becomes quite dry. Once actively growing, they can be watered more regularly, especially those growing in sunnier positions, but make sure that the compost or soil is never overly wet or waterlogged.
During the growing season they can be fed with a balanced liquid fertiliser. Begonias grown in the ground should be lifted before the first hard frosts and left to die back before being stored in a well ventilated, dry place over the winter. Container-grown plants should be brought under cover during winter and 'potted on' into a slightly larger container each year in spring.