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Ageratum Conoclinium coelestinum

Other plants called Ageratum:

Previously known as:

  • Eupatorium coelestinum
Phonetic Spelling
koh-no-KLY-nee-um koh-el-ES-tee-num
Description

Commonly called mistflower, this late summer to fall-blooming herbaceous perennial is native to the Eastern United States and is a part of the aster family (Asteraceae). It looks like the annual ageratum and in that regard is sometimes commonly called hardy ageratum. It is a showy native plant that is found in the coastal plain growing along roadsides on moist ditch banks. Under cultivation, it becomes a choice perennial with 8 weeks of blue flowers from late summer until frost. It is nectar-rich and pollinators love it.

This plant prefers moist humusy soils that do not dry out in full sun to partial shade areas.  Purplish stems have toothed deltoid leaves. Blueish purple flowers are fluffy and tubular (to 1/ 2” across). Cut back taller plants in spring to prevent flopping. This is a great plant to consider for a wildflower garden or naturalized area, does especially well around pond borders as long as spreading roots will not affect other plants.  It is not recommended for smaller planting areas as it spreads aggressively by its rhizomes and self-seeding. Propagate by clump division in early spring. This plant is moderately resistant to damage from deer. 

Quick ID Hints:

  • Erect herb with clusters of small heads of tubular flowers
  • Flowers bluish-purple
  • Leaves opposite, deltoidly ovate, crenately serrated

Insects, Diseases, or Other Plant Problems:  Leaf miners and aphids may visit. Some susceptibility to powdery mildew.  Taller plants may need support. Can spread a be a little weedy.

 

See this plant in the following landscape:
Cultivars / Varieties:
Tags:
#purple#showy flowers#purple flowers#nectar plant#blue flowers#pond margins#fire low flammability#aggressive#NC native#deer resistant#native garden#border planting#self-seeding#pollinator plant#native wildflower#wildflower garden#fantz#food source fall#food source nectar#food source pollen#Coastal FAC#Piedmont Mountains FAC#wet soils tolerant#food source hard mast fruit#butterfly friendly#Audubon#weed#wildlife friendly#collier preserve tn
 
Cultivars / Varieties:
Tags:
#purple#showy flowers#purple flowers#nectar plant#blue flowers#pond margins#fire low flammability#aggressive#NC native#deer resistant#native garden#border planting#self-seeding#pollinator plant#native wildflower#wildflower garden#fantz#food source fall#food source nectar#food source pollen#Coastal FAC#Piedmont Mountains FAC#wet soils tolerant#food source hard mast fruit#butterfly friendly#Audubon#weed#wildlife friendly#collier preserve tn
  • Attributes:
    Genus:
    Conoclinium
    Species:
    coelestinum
    Family:
    Asteraceae
    Life Cycle:
    Perennial
    Recommended Propagation Strategy:
    Division
    Root Cutting
    Seed
    Country Or Region Of Origin:
    Canada, Cuba, southeastern United States, NC
    Distribution:
    AL, AR, DC, DE, FL, GA, IL, IN, KS, KY, LA, MD, MI, MO, MS, NC, NE, NJ, NY, OH, OK, PA, SC, TN, TX, VA, WV
    Wildlife Value:
    The nectar-rich flowers are attractive to butterflies and other pollinators. Birds enjoy the seeds.
    Play Value:
    Attractive Flowers
    Attracts Pollinators
    Wildlife Food Source
  • Whole Plant Traits:
    Plant Type:
    Herbaceous Perennial
    Native Plant
    Wildflower
    Woody Plant Leaf Characteristics:
    Deciduous
    Habit/Form:
    Clumping
    Spreading
    Growth Rate:
    Rapid
    Maintenance:
    High
    Texture:
    Medium
  • Cultural Conditions:
    Light:
    Full sun (6 or more hours of direct sunlight a day)
    Partial Shade (Direct sunlight only part of the day, 2-6 hours)
    Soil Texture:
    High Organic Matter
    Soil Drainage:
    Moist
    Occasional Flooding
    NC Region:
    Coastal
    Mountains
    Piedmont
  • Fruit:
    Display/Harvest Time:
    Fall
    Fruit Description:
    Displays from August to November
  • Flowers:
    Flower Color:
    Blue
    Pink
    Purple/Lavender
    Flower Inflorescence:
    Corymb
    Flower Value To Gardener:
    Showy
    Flower Bloom Time:
    Fall
    Summer
    Flower Shape:
    Tubular
    Flower Size:
    < 1 inch
    Flower Description:
    Flat-topped clusters of disc flowers that lack rays. It has numerous small, fluffy, tubular, blue-purple flowers (to 1/ 2” across) andt blooms from July to October.
  • Leaves:
    Woody Plant Leaf Characteristics:
    Deciduous
    Leaf Color:
    Green
    Leaf Type:
    Simple
    Leaf Arrangement:
    Opposite
    Leaf Shape:
    Cuneate
    Deltoid
    Ovate
    Leaf Margin:
    Dentate
    Serrate
    Hairs Present:
    No
    Leaf Length:
    1-3 inches
    Leaf Description:
    Coarsely-toothed, ovate-deltoid leaves are up to 3 inches long and 2 inches wide. The light green upper surface has a conspicuous network of veins. Tips are bluntly pointed.
  • Stem:
    Stem Color:
    Green
    Purple/Lavender
    Red/Burgundy
    Stem Is Aromatic:
    No
    Stem Surface:
    Hairy (pubescent)
    Stem Description:
    Downy purplish stems
  • Landscape:
    Landscape Location:
    Meadow
    Naturalized Area
    Pond
    Landscape Theme:
    Butterfly Garden
    Native Garden
    Pollinator Garden
    Water Garden
    Design Feature:
    Border
    Mass Planting
    Attracts:
    Butterflies
    Moths
    Pollinators
    Songbirds
    Resistance To Challenges:
    Deer
    Fire
    Wet Soil
    Problems:
    Weedy