Dahlias are beautiful flowers that you can enjoy year after year, but the tubers don’t fare well if you leave them in the garden over the winter.
You should dig your dahlia tubers up before there’s a hard frost, according to information on dahlias from the National Garden Bureau, a non-profit organization for the gardening industry. A hard frost occurs when temperatures drop below 28.
A good indication of when to dig your tubers up is when the plant starts to turn brown and die back.
Get information on digging up, cleaning and storing dahlia tubers here.