Pruning Spring Flowering Shrubs
Shrubs that flower in spring have to be pruned directly after flowering. This applies to varieties such as forsythia, lilac (Syringa), broom (Cytisus) and currant (Ribes). Newly planted shrubs should not be pruned until the third year. Choose a dull, cloudy day for this.
After pruning the shrubs will develop new shoots that will flower the following year. If these shrubs are pruned in winter, all newly formed buds will be cut off and the shrub will produce virtually no flowers the following spring, which would be a great shame!
Flowering almond (Prunus triloba) and pussy willow (Salix caprea 'Pendula') should be pruned almost down to the main branch. Slow-growing shrubs, on the other hand, barely need pruning at all. Examples of slow-growing shrubs are witch-hazel (Hamamelis) and February daphne (Daphne mezereum).