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Hardy Ageratum Eupatorium coelestinum

Other plants called Hardy Ageratum:

Previously known as:

  • Conoclinium coelestinum
Description

Commonly called mistflower, this late summer to fall-blooming herbaceous perennial is native to the Eastern United States. It looks like the annual ageratum and in that regard is sometimes commonly called hardy ageratum. But it is perennial and can spread aggressively by rhizomes.

It is a showy native plant which is considered a weed in the coastal plain, growing along roadsides on moist ditch banks. Under cultivation, it becomes a choice perennial with 8 weeks of blue flowers.

Regions:  Mountain, Piedmont, Coastal Plains

Seasons of Interest: 

Blooms:   Late Summer/Fall           

Nut/Fruit/Seed:  Fall

Wildlife Value:  This plant is moderately resistant to damage from deer.  Its flowers are attractive to butterflies, especially smaller species, and other pollinators.  Songbirds eat the seeds.

Insects, Diseases, or Other Plant Problems: This plant has some susceptibility to powdery mildew. Leaf miners and aphids may also visit. Plants tend to flop and may need support. Spreading tendencies must be watched, particularly if planted in the perennial border.

Site: This plant is easily grown in average, medium to wet, well-drained soils in full sun to part shade. It prefers moist, fertile, humusy soils which do not dry out. Mistflower is a vigorous plant that spreads aggressively by rhizomes and self-seeding. In some areas of the U.S., the species is considered to be a spreading weed. Propagate by clump division in early spring. Plants will grow in wet areas. Taller plants may be cut back in summer to prevent flopping.

Cultivars:
Tags:
#purple#fall#white#butterflies#sun#pollinators#partial shade#summer#blue#perennial#herbs#wildflowers#ncemgva2018#low flammability#aggressive#fire resistant#pollinator garden
Cultivars:
Tags:
#purple#fall#white#butterflies#sun#pollinators#partial shade#summer#blue#perennial#herbs#wildflowers#ncemgva2018#low flammability#aggressive#fire resistant#pollinator garden
  • Attributes:
    Genus:
    Eupatorium
    Species:
    coelestinum
    Life Cycle:
    Perennial
    Recommended Propagation Strategy:
    Division
    Country Or Region Of Origin:
    Eastern US
    Distribution:
    Native to Eastern US
    Fire Risk Rating:
    low flammability
    Wildlife Value:
    Attracts pollinators and butterflies.
    Play Value:
    Wildlife Enhancement
    Particularly Resistant To (Insects/Diseases/Other Problems):
    fire in the landscape.
    Edibility:
    Seeds are edible by song birds.
  • Whole Plant Traits:
    Plant Type:
    Herb
    Native Plant
    Perennial
    Wildflower
    Habit/Form:
    Spreading
  • 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
    Loam (Silt)
    Soil Drainage:
    Good Drainage
    Occasionally Wet
    NC Region:
    Coastal
    Mountains
    Piedmont
    Usda Plant Hardiness Zone:
    5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b
  • Flowers:
    Flower Color:
    Blue
    Pink
    Purple/Lavender
    White
    Flower Bloom Time:
    Fall
    Summer
    Flower Shape:
    Tubular
    Flower Size:
    < 1 inch
    Flower Description:
    The flowers of this member of the aster family lack rays. It has numerous small, fluffy, tubular, blue-purple flowers (to 1/ 2” across) with discoid heads that bloom from July to October in dense flat topped terminal clusters (corymbs).
  • Leaves:
    Leaf Arrangement:
    Opposite
    Hairs Present:
    No
    Leaf Length:
    1-3 inches
    Leaf Description:
    Downy purplish stems are clad with coarsely-toothed, ovate-deltoid leaves (to 3” long). The leaves are opposite and triangular.
  • Stem:
    Stem Is Aromatic:
    No
  • Landscape:
    Landscape Theme:
    Pollinator Garden
    Attracts:
    Butterflies
    Pollinators
    Songbirds
    Resistance To Challenges:
    Deer