Magnus holds its rose-purple petals out flat and horizontal, which makes the flowers read larger and broader than most coneflowers. Echinacea purpurea 'Magnus' grows 2 to 3 feet tall and 18 to 24 inches wide in full sun to part sun, hardy from Zone 3 through Zone 8, and blooms the first season after planting.
Flowers open in early summer with a coppery-orange cone at the center and keep coming into fall, and deadheading extends the run. They cut well and last in a vase.
Leave the last flush of seedheads standing when the season ends. Goldfinches strip them through late fall and winter, and the dark cones hold their shape under snow.
Purple coneflower takes drought, heat, humidity, poor soil, and clay once established, which is most of the reason it turns up in so many gardens. Full sun gives the sturdiest stems. It self-sows modestly, so expect a few volunteers. Deer generally leave it alone.