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Tall with trumpet-shaped flowers, they are hardy in Zones 5 to 9.

Planting calendar for West Covina, California. Find the best dates for planting and transplanting vegetables and fruit! Our free planting guide calculates the best dates for sowing seeds indoors and outdoors, and for transplanting seedlings to the garden- all customized to your location. Based on frost dates and planting zones. 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. May 20, Prune 1/3 of the oldest branches each year, all the way to the ground.

Start by taking out the thickest stems first. Although you'll be losing some flowers for the current year, pruning overgrown lilacs is easiest early in the spring, before the branches leaf out. You can really see into the shrub and there is easier access to the base of the stems. Jun 14, Hometalk. The world's largest online community of home and garden DIYers, where you can find tons of how-to's, ideas and advice to create the home you love.

Apr 28, Don't prune later in the summer or fall. This annual pruning should take place during spring (May or June in the northern hemisphere, around September to November in the southern hemisphere). Such pruning will encourage the development of new buds, which will continue maturing over the year before they bloom the following spring%(4).