Avoid pruning your forsythia when the plant is years old.

Feb 27, Since the flowers are the only notable ornamental feature, it is important to prune at the right time of year in order to maximize bloom. Forsythia produces flower buds on current season’s growth, so if you want to maximize the flower show, prune shrubs shortly after they finish flowering. All pruning should be completed before mid-July in order to give plants enough time to put on new. Jun 22, Pruning forsythia is essential to control this growth. Trimming a forsythia while it’s young will help control their shape and size.

When to Prune Forsythia. The best time for trimming forsythia is in the spring after the blooms fade. 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. Jan 03, The usual advice is to prune after the shrub blooms in early spring. Forsythia bloom on stems that formed flower buds the previous year (called “old wood”) so if you prune before it’s flowered then you won’t have any flowers that year.

If you’ve been pruning the shrub regularly and it’s in good shape then go ahead and prune after flowering. Mar 06, Extension Educator Marjorie Peronto shares pruning tips to keep your Forsythia healthy and beautiful. Visit our site for more information about Forsythia: ht. Jan 08, When to prune Forsythia bushes Like many perennials, spring is the best time for pruning forsythia. Do this later in the spring after the blooms fade and the leaves are starting to grow. If you wait until summer or fall to trim forsythia bushes, you’ll find that the number of flowers that you get the next spring will be much less than desired.