What happens if I prune a tree at the wrong time of year?

Cherry and plum trees pruned in winter have a higher risk of silver leaf disease, a fungus that can kill a branch and, in severe cases, a tree. Birch, walnut and maple may bleed when cut in spring. That bleeding is usually not harmful, although prolonged loss of vigour is possible. Other trees may tolerate poor timing, but recovery depends on species, condition and the extent of the cuts.

We see it regularly. A homeowner who cut their plum tree in January because "winter is pruning time." A landlord who had their birch topped in March because the contractor was available. The contractor should have said no. The tree pays the price.

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