Josefine Bagger Sommerlund
There are several reasons why it might be a good idea to wait until a different season.
Spring is often the time when gardens are tidied up, and trees are pruned to encourage growth and health.
However, some trees are better left untouched until a more optimal season arrives.
Trees in Active Growth
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Trees use energy to produce new leaves and branches.
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Pruning during this period can stress the tree.
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Often results in excessive shoot growth.
Best time: Late winter when the tree is dormant
Trees That “Bleed”
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Beech, birch, elm, maple, and walnut release large amounts of sap.
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While not harmful, it can be unsightly.
Best time: Summer to minimize sap flow.
Newly Planted Trees
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The crown and leaves are crucial for photosynthesis and root development.
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Only remove damaged or dead branches in the first year.
Best time: Wait for major pruning until the tree is well-established.
Oak Trees
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Risk of oak wilt disease, spread by beetles.
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Fresh cuts can attract beetles from March to October.
Best time: If pruning is necessary, seal the wounds.
Trees Prone to Disease
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Apple, crabapple, hawthorn, and pear trees can develop bacterial infections like fire blight.
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American elms are vulnerable to bark beetles.
Best time: Prune in the winter months
Spring-Flowering Trees
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Cherry, lilac, plum, and Judas trees shouldn’t be pruned too early.
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Early pruning removes flower buds.
Best time: After blooming, no later than one month after the flowers fall.
Certain Conifers
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Pine trees should be pruned in late spring for denser growth.
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Spruce and fir trees are best pruned in late winter to avoid excessive resin flow.
Mature Trees
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Summer is ideal for thinning out older trees.
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Easier to identify weak or dead branches.
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The tree is better equipped to heal pruning wounds.
Summary & Best Practices
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Consider timing carefully to protect your trees.
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Waiting for the right season promotes healthy growth and reduces disease risks.
Reminder: Every tree has unique needs, so plan your pruning accordingly.
