Reasons behind Failure to Bloom Asters

Asters are perennial flowers that bloom near the end of the growing season. They produce voluminous sprays of small, daisy-like flowers in shades of sapphire, pink, purple, and white. Suited to USDA Hardiness Zones 4 to 8, they prefer full sun and slightly acidic, organically rich, well-drained soil. Vigorous plants, they naturalize readily via self-sowing