Overwintering Begonia 'Betulia' in the UK: Indoor Care

Christopher in Milton Keynes, UK has Betulia begonia in large pot. Asks about frost protection: garage or indoors?

Advice (C.L.)

Begonias don't survive below 50°F/10°C. Bring indoors before nights drop that low. Easiest: east-facing window, water when dry, no fertilizer until after New Year. May look pathetic but survives. Alternative: let die back in cool garage, restart in March/April (less reliable). In spring, trim ragged leaves, fertilize, move out. Repot with fresh soil/compost after two years.