Answer: Lilacs grow best in full sunshine and slightly alkaline soil. Some take a few years to adjust and mature enough to bloom, and all need a pronounced winter chill to develop blossoms. Last winter should have provided the necessary chill for your lilacs, and if they've bloomed in the past, they're certainly mature enough. That leaves us with just one concern: your soil is probably too acidic for the lilac's taste. Try sweetening the soil with an application of lime around the plant's base. Lime takes a while to dissolve and mellow the soil, but if you make an application now, it should take effect by next spring's bloom time. (You might want to test your soil's pH prior to a lime application, but I suspect it's on the acidic side.) Hope this helps!
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