Kickin' Sapphire opens clear violet-blue with yellow centers, a truer blue than most fall asters manage. Symphyotrichum novae-angliae Kickin' Sapphire grows 2 to 3 feet tall and wide in full sun to part sun, hardy from Zone 5 through Zone 8, and blooms the first season after planting.
Flowers open in late summer and continue into fall, covering the plant so thickly that the foliage disappears at peak. Bees come to them steadily through the bloom, at a point in the season when little else is producing nectar.
The habit forms a dense cushion on its own, so it does not need staking or a June cutback the way the tall New England asters do.
New England asters want moist soil, though this one also handles drought and moderate road salt once established. Full sun gives the heaviest bloom and keeps the lower foliage cleaner. Give it room for air movement rather than crowding it. Deer generally leave it alone.