Root systems of most perennials must be divided every few years (in most cases about every 3 years), as they become crowded and the stems and flowers become small and weak. This is a fall job, except in the very cold sections, where early spring is preferable. Root divisions may be used to increase stock.
PLANNING THE PERENNIAL BORDER
PERENNIAL PLANTS FROM SEEDS
PREPARING PERENNIAL BEDS
TRANSPLANTING PERENNIALS
CARE OF ESTABLISHED PERENNIALS
INSECT AND DISEASE CONTROL
WINTER PROTECTION
DIVIDING
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