Lilacs need 2000+ chill hours (<45°F). Alpharetta gets ~1500. Solution: low-chill varieties.
'Lavender Lady', 'Blue Boy', 'Dark Knight', 'Miss Kim', 'Betsy Ross', 'White Angel' ('Angel White'), Syringa laciniata (cutleaf).
pH ~7.0 (add lime). Most GA soils are ~5.0.
5 plants blooming in GA. Keys: part sun, sheltered spot keeping ground cold (near wall), persistence. They won't grow like MN weeds, but they work.
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