Floss Flower (Ageratum houstonianum)

Floss Flower

Ageratum houstonianum

Fluffy powder-blue blooms soften garden edges with gentle charm. Herbaceous annual flowering plant; common name: floss flower.

Full sun to partial shade; tolerates light afternoon shade in hot climates for reduced stress
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates light afternoon shade in hot climates for reduced stress
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Watering Water when top 2–3 cm of soil is dry; avoid overwatering to prevent root rot and fungal growth
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Temperature Thrives in warm temperatures; sensitive to frost, move indoors or discard after first frost in cool regions
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Characteristics

  • Leaf: Oval to heart-shaped, fuzzy, medium green with serrated margins
  • Flower: Dense, fluffy composite heads in shades of blue, white, or pink; resemble tiny pom-poms
  • Stem: Stiff, branched, covered in fine white hairs
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Care Guide

Watering

Keep soil consistently moist but not waterlogged to support active growth and blooming

Fertilization

Diluted balanced liquid feed every 2 weeks. Avoid over-fertilizing, as this can lead to leggy growth and reduced flowering

Banana peel tea:Soak 1 chopped banana peel in 1 liter of water for 24 hours; strain and use the liquid to water plants, discarding the solid peel to prevent pests
Pruning
  • Deadhead spent blooms regularly to encourage continuous flowering throughout the growing season
  • Pinch back young seedlings to promote bushier, more compact growth
  • Trim leggy stems mid-season to maintain a neat mounding habit
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-verified non-toxic; safe for cats with no reported toxicity

Humans: Non-toxic to humans; no known adverse effects from ingestion or contact

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental for garden borders, hanging baskets, and cut flower arrangements; attracts butterflies and pollinators