Aster novae-angliae 'Kickin® Sapphire' (New England Aster 'Kickin Sapphire') is a standout for late-summer through fall color, with masses of blue-purple, daisy-like blooms that light up the garden when many perennials are winding down. You'll get upright, branching stems and a full display that pairs beautifully with ornamental grasses and other autumn favorites.
Place it where it can receive full sun to part shade. More sun generally means more flowers and sturdier growth. In very hot climates, a little afternoon shade can help the plant look fresher, especially during dry stretches. Provide average to consistently moist, well-drained soil; once established, keep the plant from drying out completely during extended heat for best flowering.
Mature size is typically about 24-36 inches tall with a 24-36 inch spread. If you want a fuller, bushier plant, you can pinch or lightly shear stems in late spring to early summer. Taller stems may benefit from discreet support in windy sites. Deadheading isn't required, but trimming spent blooms can tidy the plant and extend the neat look in borders.
As the season ends, you can cut stems back after flowering or leave them until late winter for structure, then cut to the ground before new growth starts. Give the plant good air circulation and avoid overhead watering late in the day to help reduce common aster leaf issues.