Alternate freezing and thawing, rather than extreme cold, is the real danger to perennials. In most sections of the United States, beds should be mulched during the winter. Apply mulch after the ground is frozen.
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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