Pruning Forsythia After Flowering. All pruning should be completed before mid july in order to give plants enough time to put on new growth and develop flower buds. This is the best time to prune your forsythia.
The usual advice is to prune after the shrub blooms in early spring. The best practice is aligning the timing of your pruning based on what results in your desire to accomplish. Wait for your yellow flowers to fade and for the leaves to grow.
The usual advice is to prune after the shrub blooms in early spring.
At this point the plant starts to develop next year s buds and the plant carries the buds through the fall and winter season. All pruning should be completed before mid july in order to give plants enough time to put on new growth and develop flower buds. Pruning forsythia in late summer or fall will reduce the number of flowers in the spring since these shrubs bloom on old wood and set their flower buds soon after new growth appears. How to trim forsythias.