10 Seeds Conoclinium coelestinum Hardy Ageratum Native Wildflower

Conoclinium coelestinum, commonly called hardy ageratum, is a herbaceous perennial native to the eastern and central United States. It is valued for its late-season display of fluffy, misty blue-purple flower heads that rise above bright green foliage, drawing attention in perennial borders and naturalized areas. Its spreading habit and reliable bloom make it a popular choice for meadow plantings, pollinator gardens, and rain gardens.

This species is grown for its ornamental value, where its cloud-like blue flowers provide late summer and autumn color in mixed borders and wildflower meadows. It performs well in moist soils and can naturalize readily in suitable sites, gradually forming dense colonies over time. Plants pair well with other moisture-loving perennials and ornamental grasses in informal or cottage-style landscapes.
Species: Conoclinium coelestinum
Type: Herbaceous perennial
Plant_Habit: Upright, spreading by rhizomes
Sun: Full sun to part shade
Soil: Moist to wet, well-draining
Zones: 5-10
Germination: 14-30 days at 65-75F, surface sow, light needed
Sowing: Start indoors 6-8 weeks before last frost
Spacing: 12-18 inches
Notes: Late-season blooms, naturalizes in moist sites