Answer: I think your lilac knows best. Leafing out is triggered by weather and your lilac just doesn't think it's quite warm enough to leaf out. As long as the branches are alive and buds are fat and healthy, I wouldn't worry too much about it. It will perform when it's ready. In the meantime, you'll just have to exercise some patience. Enjoy those fragrant blossoms - when they finally do unfold!
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