Jun 22, 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. Trimming a forsythia while it’s young will help control their shape. Apr 01, Fill the pot to within one-half inch (1 cm.) of the top with perlite or sand.
Moisten the perlite or sand and allow the pot to drain. In June or July, take 4 to 6 inch ( cm.) cuttings from the tips of the current year’s growth.
Remove the leaves from the lower half of the cutting and dip 2 inches (5 cm.) of the cut end in rooting treeleaning.buzzted Reading Time: 3 mins. Jan 03, This makes room for new growth and allows sunlight into middle of the forsythia so that it can put out leaves and flowers all over the shrub, rather than just at the tips of the branches.
Whatever you do, do not simply cut off the tips of the branches or lop them off part way down the stem. Forsythia respond to that type of pruning by putting out tons of new growth just below the cut. Cutting Preparation. To take a cutting, cut a 3- to 5-inch piece from the parent stock and remove the blooms or buds so the cutting will focus on root growth rather than flower formation.
Apr 12, Use the trench to level the bush up so that you can loosen the roots under the bush. Dig a new hold the same depth and twice the diameter of the root ball. Water the new hole well. Get garden soil and compost ready for replanting. Lever the forsythia shrub out Estimated Reading Time: 10 mins.