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The end result is the need for a drastic pruning job.

May 22, 1. Prune forsythia plants right after they finish blooming in the spring. Wait for your yellow flowers to fade and for the leaves to grow. At this point, the plant starts to develop next year's buds, and the plant carries the buds through the fall and winter season. This is the best time to prune your forsythia%. Jan 03, The timing of your pruning depends on what you’re trying to accomplish.

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. Dec 31, Keep the healthiest looking ones. They will bloom their second year. If you are wondering when to hard prune forsythias, the best answer is when the shrub gets really rangy-looking, is overgrowing its space or has dramatically reduced flowering due to old age.

Hard pruning forsythias is best done in late fall. Feb 27, Asked n Feb 27, When do you trim a forsythia bush? Answer this question + 3. Feb 27, Asked on Feb 27, When do you trim a forsythia bush? Answer + 3. Apr 20, This is best done in the spring after flowering and when the plant is at least 1 year old since you will be removing whole branches. See my tips for pruning forsythia here. May 30, Forsythia are very hardy, and there should be no problems with pruning at this point.

General rule: as long as the plant/bush is quiet, i.e., not actively budding or flowering it should be OK. Better to do it on a day when the weather is not projected to be extremely hot/humid.