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Why and When to Prune

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Nicely pruned hawthorne
Photo Credit: Joe Seals
It takes well-timed pruning to get a tree with such a nicely balanced look.
There are several reasons to prune plants:
  1. To control a plant’s size or form and enhance its beauty and character (aesthetics).
  2. To promote a healthy plant by removing existing damage (perhaps caused by mechanical mishaps, disease, etc.)
  3. To improve flowering and fruiting by increasing air and light circulation – which also helps prevent diseases.
  4. To direct or confine growth to prevent potential damage that can be caused by overlapping branches and poor crotch angles.
  5. To stimulate new growth on older plants that have slowed in leaf and branch production, or to simply fill in bare areas.
  6. To prevent personal injury or property damage due to out-of-control branches.
  7. To train young plants for bonsai, topiary, espalier or other types of special plant training techniques.

When should you prune? This depends on the situation.

Corrective pruning, due to injury or dead tissue, should be done as soon as the problem is evident.

Serious pruning – when large limbs need to be removed – should be done during the dormant season (winter for typical deciduous plants) or depending on the plant’s flowering time. For flowering time scheduling, follow the “May Rule:” If the plant blooms BEFORE May 1, prune immediately after flowering has ended. Flowers of these plants are produced on old wood or last year’s growth. (Examples are spring-blooming trees.) If the plant blooms AFTER May 1, prune during the dormant season. Flowers of these plants are produced on new growth or current year’s growth. (Crape myrtles are a good example.)

There’s just one exception to the May Rule: All hydrangeas (which are summer bloomers) should be pruned immediately after flowering.

Warnings
  • Severe pruning – in branch size or with quantity of cuts – during a plant’s active growing period can seriously spoil the growth of the plant.
Tips
  • One key to pruning, of course, is to identify the plant before you touch it. This will lead to knowing your plant’s flowering cycle, growing period and dormant time – all crucial to pruning at the best time. Look in illustrated books or, with piece of plant in hand, ask a local nursery professional or Master Gardener to help you identify your plant.
 
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  • Pruning Tools & Techniques
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