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Apr 02, 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. If you trim a lilac bush too late in the year, then you’ll cut off unwanted branches and next year’s blossoms. The ideal time to prune is just after the bush finishes blooming for the year. Spring, however, before the leaves pop out, is best. Fall (September through late October) is second best.

Lilacs love manure, be it bagged or au natural; compost also is good, as is fertilizer. Now and then, sprinkle a little lime or wood ashes around your plants because they appreciate near-neutral soil.

Jun 26, Timing is the Decisive Factor in Pruning Lilacs. If you want to have your blooms next year, it is crucial to prune in those first few weeks after blooming ends. Ideally, this is when you would do maintenance pruning each year. But I get so lazy busy, I end up with a ten foot bush with ten blooms on bushclear.buzzted Reading Time: 4 mins.

Jul 08, 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. The time to prune mature lilac plants is just after the flowers have faded in the spring. Jun 01, When to Transplant Lilacs.

If you are wondering when to transplant lilacs, you have two choices: autumn or spring. Most experts recommend that you act in spring.

The optimal time is after the plants bloom but before summer’s heat arrives in force. Jun 10, 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 bushclear.buzz: K. Apr 12, Lilac only bloom in the spring and then remain leafy and green until fall.

I was told it is best to trim the blooms as they begin to die. You can trim them back a bit throughout the summer, but for a full trim it is best to wait until fall. It will grow back nice and full in the spring. Happy bush trimming!