Divide and replant clumps in autumn or early spring

Many plants can be divided in either spring or autumn. Division is useful for three main reasons - size control, rejuvenation, and propagation. Some plants are quite vigorous and can crowd out neighbouring plants if left alone. Others lose vigour if not divided on a fairly regular basis.

With the mass of roots exposed, identify a spot where an offshoot can be separated from the plant near the base, or where the plant can be split into two or more equal parts.

A variety of tools can be used to assist in dividing plants. Many people use a sharp knife, scissors or garden pruners. A special plant-dividing knife with a serrated blade used with two garden forks are ideal for dividing most types of plants. These tools are available from garden centers. Whichever tool is used, it is best to make clean cuts whenever possible. Avoid tearing or ripping roots. Roots heal more efficiently from clean cuts rather than jagged tears.