Answer: Lilacs need well-drained, neutral to slightly alkaline soil, and regular water during the spring and early summer months. It's best to apply water slowly, applying about one-inch per week and allowing it to percolate down and wet the entire rootmass. Withholding water during late summer and early fall will force the plants into dormancy which will result in bigger flowers the following year. In general terms, trees and shrubs do best with deep soakings rather than frequent light waterings. If your sprinkler system delivers a deep soaking to your lawn, your lilacs should be happy. Just make sure the soil drains quickly and you'll avoid root rot problems with your lilacs.
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