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Propagating Lilacs and Pruning Forsythia & Wisteria: A Step-by-Step Guide

Lilacs, forsythia, and wisteria are beloved spring bloomers, but each requires specific care for propagation and pruning.

Lilac Cuttings

Lilacs root readily only during a brief two-week window after blooms fade. Take 6–8 inch cuttings of new growth, remove the lowest leaf pair, dip the cut ends in rooting hormone, and insert into moist vermiculite. Cover the container with a plastic bag (secured with a twist-tie) and place in shade. Roots should form in 6–8 weeks. Gradually open the bag over a week to acclimate, then pot in well-draining mix, fertilize lightly, and keep out of direct sun. Plant outdoors in September.

Alternatively, remove and replant suckers from the base, but note that on grafted lilacs, suckers will be the rootstock (common lilac), not the hybrid.

Pruning Forsythia

Prune immediately after flowering by cutting back about one-third of the oldest stems to the ground. This encourages vigorous new growth that will bear next year's flowers.

Pruning Wisteria

Prune after blooming, removing unwanted growth and shortening long shoots to 6 inches to promote flower bud formation. Regular pruning keeps this vigorous vine in check and improves flowering.

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