Lilacs for Zone 9 Common lilacs (Syringa vulgaris) are the old-fashioned type of lilac and offer the biggest flowers, the best fragrance and the most enduring blooms. They typically require chilly periods in winter and only thrive in zones 5 through 7. They are not appropriate as lilacs for zone 9.Click to see full answer. Consequently, what zone do lilacs grow in?Common lilacs (Syringa vulgaris) are the old-fashioned type of lilac and offer the biggest flowers, the best fragrance and the most enduring blooms. They typically require chilly periods in winter and only thrive in zones 5 through 7.One may also ask, do lilac bushes grow in Arizona? Growing Lilacs In Arizona – Knowledgebase Question. Lilacs will grow in the alkaline soil in your region, but will not be a dependable performer because lilacs need a pronounced winter chill to produce flowers. There are a few hybrids developed by Descanso Gardens that will bloom without a winter chill. Thereof, where do lilacs grow best? Planting Grow lilacs in fertile, humus-rich, well-drained, neutral to alkaline soil (at a pH near 7.0). Select a site where your lilac will get full sun—at least 6 hours. Make sure the site drains well. Plant in either spring or fall, although the latter is preferred. Can you grow lilacs in the South?Sadly, not all lilacs are suited to the heat of the south. They often need a long period of winter chill for buds to mature and bloom the following spring. However, some lilac varieties and cultivars bloom well in the Lower South Region.