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How Far Back Can You Trim a Rhododendron?

Rhododendrons, vigorous perennial shrubs, are grown for their showy flower clusters and greenery. Trim your rhododendron by cutting off fading flowers, or by pruning a mature shrub down to leafless sticks.

Features

According to the American Rhododendron Society, removing spent foliage and flowers encourages new growth. You can also prune back to older wood; new, branching growth will fill out the shrub.

Light Pruning

Nip back young rhododendrons by pruning stems back to a leaf rosette. Auxiliary buds fill out with new leafy growth. Snip off spent blooms, called deadheading, to clean up shrubs after flowering.

Moderate Pruning

Renew your rhododendron in thirds. After flowering, cut out one-third of the shrub stems down until they are only several inches tall. Do this for three years for full renewal.

Heavy Pruning

Prune your older rhododendron down to the leafless stalks or stems after flowering. This drastic pruning revitalises the whole plant. The National Rhododendron Society recommends drastic pruning only for shrubs with multiple stems. Hybrids with only one stem may not survive.

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About the Author

Phyllis Benson is a professional writer and creative artist. Her 25-year background includes work as an editor, syndicated reporter and feature writer for publications including "Journal Plus," "McClatchy Newspapers" and "Sacramento Union." Benson earned her Bachelor of Science degree at California Polytechnic University.