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One spring trim can stop a lilac flowering while encouraging strong young shoots on a summer-flowering spirea. The reason is not necessarily plant quality: different shrubs form flower buds on wood of different ages. Correct pruning therefore starts with identifying the species and observing its flowering.
Get to know your plant
Keep the label, take a photograph of the whole shrub and a close-up of its flowers. Sometimes the species matters as much as the genus: two spireas may need pruning at different times. If the name is unknown, avoid heavy trimming just to produce a neat silhouette. First establish what is growing on your plot.
In early-flowering shrubs, many future flowers are carried on the previous year's growth. Main pruning is therefore usually done after flowering, as with forsythia and mock orange. The principle and exceptions — RHS.
Separate removal of damaged wood from shaping
Remove a dead or broken branch for the plant's health and safety. Reducing height or changing shape is a different task. Do not automatically combine both in one major pass: identify problem branches first, then assess the remaining crown.
Use sharp tools suited to the branch thickness. Secateurs should not crush the wood. When moving from a plant with suspicious symptoms to a healthy one, clean and disinfect tools according to the chosen product's instructions.
Do not turn every shrub into a ball
A lilac or mock orange's natural, open shape may look better than a dense shell of shortened shoots. If a mature shrub is overcrowded, gradually removing some old branches at the base can be more useful than cutting every shoot tip annually. Choose the amount and intensity of rejuvenation according to the species and its condition.
Step back after each stage to check the crown's balance. Leave a newly planted shrub enough foliage to support root recovery; avoid combining major reshaping with establishment.
Record the result
After pruning, note the date and amount removed, and water according to soil moisture. Do not treat feeding as mandatory compensation for every pruning session.
Next season, compare the number and position of flowers. If flowering has weakened, check the timing of the previous trim, light levels and plant condition. A small log helps you gradually adapt care to your shrub rather than follow a universal calendar for every ornamental plant.