Answer: You didn't say how long ago you transplanted your lilac, but if it was within the last few months, it may still be undergoing a little transplant shock. Lilacs grow best in full sunshine, in neutral to slightly alkaline soil. Since yours was in a pot, it probably was growing in a potting mix rather than garden soil. Most likely your garden soil is more acidic than the potting soil your lilac was used to and it's showing its stress with yellowing leaves. Wilting, even though the plant is watered regularly, can indicate poorly draining soil. I'd dig the lilac, find a sunnier site, amend the soil with a little lime to raise the pH, then replant. When you water (once a week should be fine), apply the water slowly so it percolates down to wet the entire root mass. Don't prune or fertilize your lilac at this point - allow it to become established in its new home and regain its health first. Best wishes with your lilac.
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