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Deformed leaves on lilacs

I live in Wyoming, Zone 4. I have 3 lilac bushes on the west side of the house. They are fairly close to the house, so I know they don't get full sun. They have been there 13 years. The last couple of years I have noticed that the leaves don't look like lilac leaves. These leaves are rounded, curled up on the edges and tough to the touch. The flowers were even pale and not totally formed. I don't see any bugs on them. Do you have any idea what's going on?
Submitted by BHGPhotoContest

Are you using weed killer on your lawn?  Your description of curled leaf edges and toughened leaf margins is a typical symptom of broadleaf herbicide injury. The herbicide 2,4-D can volatilize and move through the air fairly long distances. Dicamba can move through the soil. (And lilac roots can spread 3-4 times the width of the branch spread.) Either mode of action could result in the symptoms that you've seen.

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