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They are perennial plants that bloom in the spring, and start shedding-off flowers.

Apr 02, When to Trim Lilac Bushes. Knowing when to trim lilac bushes is important. Most lilacs don’t require pruning until they reach about 6 to 8 feet ( m.) tall. The best time for pruning lilac bushes is right after their flowering has ceased.

This allows new shoots plenty of time to develop the next season of blooms. Pruning lilacs too late can kill young developing buds.

Jul 08, When to Prune Lilac Bushes. Many of the newer lilac varieties grow quickly and might need pruning starting in their second or third year. In general, by the time a stem reaches more than 2 inches in diameter, it should be pruned. If you are diligent with annual pruning of your lilac, the shrub will grow to about 8 feet tall with flowers throughout the branches. Jun 19, Knowing when to trim older lilac bushes is important. Most lilacs don’t require pruning until they reach about 6 to 8 feet tall.

The best time for pruning older lilac bushes is right after their flowering has ceased. This allows new shoots time to develop the next season of blooms.

Pruning too late can kill young developing bushtrimmers.buzzted Reading Time: 3 mins. Apr 28, This type of pruning goes beyond a lighter annual pruning to severely cut the bush or tree back, allowing for new growth to occur.

Do your assessment in early spring, before the lilac has come back to life. This is the best time of year for a deeper pruning%(4). Oct 06, While a little care is required to keep plants healthy and strong, getting too happy with the pruning shears early in the life of flowers like the lilac results in stunted or dead plants.

You should resist the temptation to prune or trim your lilac bush until it is at least 6 ft. tall, which typically occurs during the second or third year of growth. As soon as the lilac bush's flowers are dead, trim each flower stem back to the leaves, removing all trace of the flowers.

This step stops the lilac from using its energy to make seeds. Prune In Late Spring: You must have observed that the lilac bushes bloom only on old growth. Prune them right after they have finished blooming, and before they have started budding for the next year’s show. They are perennial plants that bloom in the spring, and start shedding-off flowers by the end of the season.