Answer: Lilacs grow best in full sunshine but they can take a full season to become established after being planted. They form flower buds for next year's floral display during the summer months so you'll want to wait until after flowering has finished next year to prune. Since pruning encourages new growth, pruning early next summer will help your lilacs become bushy and full. Don't feed or prune now - wait until spring to feed and early summer to prune. Lilacs are cold hardy so no special treatment is necessary. Be sure your lilacs are getting adequate water (one-inch per week from spring through fall) and look for healthy new growth next spring.
Best wishes with your lilacs!
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