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Your Garden
The Premier
Gardeners
Guide
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Pruning Shrubs
An important part of growing shrubs is knowing when to prune. Proper
timing helps to insure attractive, healthy, productive shrubs. The
proper time to prune various shrubs in your garden are
indicated below.
Deciduous Shrubs
Many deciduous shrubs
are planted in the home landscape for their
attractive flowers. Spring-flowering shrubs bloom in the spring on the
growth of the previous season. Two widely planted examples are the
lilac and forsythia. The proper time to prune spring-flowering shrubs
is largely determined by their condition and the amount of pruning
required.
Old, neglected
spring-flowering shrubs often require extensive pruning
to rejuvenate or renew the plants. The best time to rejuvenate large,
overgrown shrubs is late winter or early spring (mid-February to early
April) before the plants begin to leaf out. While heavy pruning in late
winter or early spring will reduce or eliminate the flower display for
a few years, the restoration of a healthy, vigorous shrub is more
important.
If spring-flowering
shrubs need only light pruning, prune them
immediately after blooming. Pruning immediately after bloom allows the
gardener to enjoy the spring flower display and gives the shrubs
adequate time to initiate new flower buds for next season.
Summer-flowering
shrubs, such as potentilla and Japanese spirea, bloom
in summer on the current year's growth. Prune these shrubs in late
winter or early spring. Summer-flowering shrubs pruned from
mid-February to early April will still bloom in summer.
Many deciduous shrubs
don't produce attractive flowers. These shrubs
may possess attractive bark, fruit, or fall leaf color. Prune these
shrubs in late winter or early spring.
Don't prune deciduous
shrubs in late summer. Pruning shrubs in August
or early September may encourage a late flush of growth. This new
growth may not harden sufficiently before the arrival of cold weather
and be susceptible to winter injury.
Evergreen Shrubs
Prune evergreen
shrubs, such as juniper and yew, in late March or early
April before new growth begins. Light pruning may also be done in late
June or early July. Avoid pruning evergreen shrubs in the fall. Fall
pruned evergreens are more susceptible to winter injury.
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