Cutting Back Forsythia Uk. For the very oldest and most overgrown forsythia pruning should be brutal cropping the entire shrub to about 4 inches 10 cm from the ground. That s right whack it to the ground.
Forsythia Rhs Gardening from www.rhs.org.uk
Not just at the top of an untidy mess of a shrub. Forsythia are vigorous shrubs that quickly bounce back from this type of rejuvenation pruning provided that the shrub is healthy to start with. Pruning forsythia right can make them a real asset to the garden says matthew wilson.
Use them with other shrubs or as part of an informal flowering hedge.
Cut branches back to their point of origin to thin out the canopy. Cut branches back to their point of origin to thin out the canopy. That s right whack it to the ground. This will help it establish a good root system.