how do i over winter canna?

Brian. Do you have a greenhouse? If yes, is it heated? What area of the UK are you in? Is the canna in the border or a pot?

John.

Lift the canna as soon as the first frost has blackened the foliage and cut the stems down to about 6 inches. Keep the plant whole and don't be tempted to divide the clump. Repot the plant into a plastic container of slightly moist, peaty compost. Place the pot in a frost free environment such as a garage, shed, greenhouse and do not allow to dry out. But keep only slightly damp.

Divide in Spring when the new growth reaches about 2.5 inches.