General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Partial or Dappled Shade
Water Preferences: Mesic
Dry Mesic
Dry
Minimum cold hardiness: Zone 10a -1.1 °C (30 °F) to +1.7 °C (35 °F)
Maximum recommended zone: Zone 13
Plant Height: 18 inches
Plant Spread: 12 - 18 inches
Flowers: Showy
Flower Color: Lavender
Flower Time: Late spring or early summer
Summer
Late summer or early fall
Fall
Late fall or early winter
Uses: Cut Flower
Suitable as Annual
Wildlife Attractant: Bees
Butterflies
Resistances: Deer Resistant
Rabbit Resistant
Drought tolerant
Pollinators: Moths and Butterflies
Containers: Suitable in 3 gallon or larger
Needs excellent drainage in pots
Awards and Recognitions: RHS AGM

Image
Common names
  • Ageratum
  • Floss Flower

Photo Gallery
Location: St Louis - Missouri Botanical Garden
Date: 2023-08-05
Location: At Annie's Annuals Nursery
Date: Sep 14, 2008 1:10 PM

Photo courtesy of Harris Seeds
  • Uploaded by Joy
Location: Matthaei Botanical Gardens, Ann Arbor, MI
Date: 2011-07-21

Photo courtesy of Annie's Annuals and Perennials
Location: Matthaei Botanical Gardens, Ann Arbor, MI
Date: 2011-07-21
Location: Matthaei Botanical Gardens, Ann Arbor, MI
Date: 2011-07-21
Location: Matthaei Botanical Gardens, Ann Arbor, MI
Date: 2011-07-21
Location: Matthaei Botanical Gardens, Ann Arbor, MI
Date: 2011-07-21

Photo Courtesy of Select Seeds. Used with permission.
  • Uploaded by Joy

Photo courtesy of Annie's Annuals and Perennials
  • Uploaded by Joy

Photo courtesy of Annie's Annuals and Perennials
  • Uploaded by Joy
Location: Annie's Annuals Nursery
Photo courtesy of Annie's Annuals and Perennials

Date: August
credit: Dwight Sipler

Photo by Krzysztof Ziarnek, Kenraiz
This plant is tagged in:
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Comments:
  • Posted by sucrose (Ohio - Zone 6a) on Jul 2, 2021 8:57 AM concerning plant:
    Blue horizon has tall flower stems, makes great cut flower. Better to buy container grown instead of growing from seed. Cut back initial flowers to boost growth and blooming.

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