Lilacs grow finest in full sunlight, nonacid soil, and anywhere there is high-quality drainage. They require a winter freeze to offer a dormant, or rest, period. Single shrubs, given plenty of room, produce full and tall, attainment a height of 10 to 25 feet. For utmost bloom, however, they have to be kept to a moderate height. Pruning back young growth to keep the center open also helps flowering.
Lilacs belong to the olive family, Oleaceae. The name of the genus, Syringa ("little pipe"), was agreed it because lilac stems were once hollowed out and worn as pipe stems. Syringa is also the common name for an unrelated shrub, the mock orange. The scientific name of the common lilac with purple flowers is Syringa vulgaris; of the Persian lilac, a smaller shrub by means of white flowers, Syringa persica.
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