With an overgrown forsythia, we would consider a total rejuvenation every 3 to 4 years. Cut all branches to the ground and let the shrub resprout. The forsythia can take a severe approach. If this is too much for you, you can prune a third of the oldest branches shortly after flowering in the first year, followed by half in the second year and the remainder in the third year.
With an overgrown forsythia, we would consider a total rejuvenation every 3 to 4 years. Cut all branches to the ground and let the shrub resprout. The forsythia can take a severe approach. If this is too much for you, you can prune a third of the oldest branches shortly after flowering in the first year, followed by half in the second year and the remainder in the third year.