Jun 22, With diligent trimming, forsythia can be kept from the overgrown sprawl that is a common complaint. Young plants may only need a modest trimming. Forsythia that has been untended for years may need to be lopped to the ground. Forsythias are fast growing shrubs that can grow up to 10 feet (3 m.) tall and just as wide.
Pruning forsythia is essential to control this growth. Prune these spring flowering shrubs soon after they have bloomed.
Top prune the plant to improve the shape and reduce its size, but be careful not to remove more than 30% of the top growth. Some summer pruning can also be done on particularly vigorous plants, but not after mid-July.
As the plant matures, some “renewal pruning” should be done. May 22, You’ll want to prune your forsythia in the spring after its yellow flowers fade and its leaves start to grow so it’ll grow better next year.
If your forsythia plant is under 5 years old, it’ll need little to no pruning. However, once they’re 5 or 6, you’ll want to prune them once a year%. 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. May 04, Tips for growing, pruning and planting a forsythia shrub.
There may be other questions that you have in mind about growing forsythia. These posts should be helpful to you. So, grab a cup of coffee and enjoy reading my tips for growing and general.