1.   Dig dahlia clumps after a frost blackens their leaves, taking care not to break the tubers.

2.   Dig dahlia clumps after a frost blackens their leaves, taking care not to break tubers.

3.   Do not disturb tender summer-flowering bulbs or tuberous plants like cannas and dahlias until foliage is blackened by frost.

4.   Scatter a handful of fertilizer around the plant each autumn, and cut back the dead foliage after it is blackened by frost.

5.   The roots and tubers are easy to deal with, but the coleus must have cuttings taken before frost blackens all the garden foliage.

6.   When frost has blackened the tops, cut them back to two inches above the soil.