500 Seeds Flossflower Ageratum houstonianum

Flossflower (Ageratum houstonianum) is a compact annual prized for its fluffy, powder-puff flower clusters that bloom generously from early summer until frost. Its tidy, mounding habit and soft blue-toned blossoms make it a dependable choice for borders, edging, and mixed container plantings, where it delivers steady color with minimal fuss.

These blooms work beautifully in bedding schemes, window boxes, and pollinator-friendly garden corners, pairing well with marigolds, salvias, and other warm-season annuals. Plants grow quickly from seed and perform best in full sun to partial shade with evenly moist, well-drained soil. Deadheading spent flowers encourages continued bloom through the season.
Species: Ageratum houstonianum
Type: Annual
Plant Habit: Compact, mounding
Sun: Full sun to partial shade
Soil: Well-drained, evenly moist
Days to Harvest: Not applicable
Zones: Grown as annual in all zones
Germination: 7-14 days at 70-75F
Sowing: Surface sow, lightly press into soil, do not cover heavily
Spacing: 8-12 inches apart
Notes: Deadhead to prolong bloom; keep soil consistently moist