Some shrubs and trees naturally develop a well-branched framework, requiring minimal pruning. In fact, excessive pruning can harm their natural beauty. These plants belong to RHS Pruning Group 1, and this guide will help you understand when and how to prune them effectively.
Plants Suitable for Light Pruning
This method is ideal for both evergreen and deciduous trees and shrubs that don’t produce vigorous growth requiring control. These plants often bloom on either the previous year’s growth or the current season’s new shoots.
Examples:
- Evergreens:
- Strawberry tree (Arbutus)
- Holly (Ilex)
- Bay (Laurus)
- Deciduous trees and shrubs:
- Japanese maple (Acer palmatum)
- Snowy mespilus (Amelanchier)
- Deciduous azalea (Rhododendron sp.)
- Flowering dogwood (Cornus kousa)
- Witch hazel (Hamamelis)
- Magnolia
- Lilac (Syringa)
When to Lightly Prune
- Late Winter to Early Spring
This is the ideal time for most shrubs and trees. However, some deciduous varieties like birch (Betula) and magnolias may « bleed » sap if pruned too early. For these, prune in late summer or early autumn to prevent stress and encourage faster healing. - After Flowering
Shrubs like deciduous azaleas and lilacs should be pruned immediately after their blooms fade to avoid cutting off the next season’s flower buds.
How to Lightly Prune
Light pruning requires no routine cutting but focuses on maintaining the plant’s natural form and health. Follow these simple steps:
- Remove diseased, damaged, or crossing branches.
- Thin out congested growth to improve airflow and sunlight penetration.
- Cut shoots growing in unwanted directions.
- After pruning, mulch and feed the plant to promote healthy regrowth.
Common Problems
While pruning, be aware of potential issues, including:
- Bacterial canker
- Bracket fungi
- Coral spot
- Verticillium wilt