Answer: When leaves are deformed it's usually an indication of stress, or of insect activity. If aphids feed on the leaf buds, the unfolding leaves can appear crinkled or puckered. Since you've only recently installed this lilac in your landscape, I suspect it's a little stressed. It should become established by the end of the season and produce regular looking leaves. Blossoms will probably be normal looking, as well. Lilac's can take a few years to produce blooms, so if yours doesn't flower next spring, just be patient with it - eventually it will.
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