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Horse Weed Erigeron canadensis

Previously known as:

  • Conyza canadensis
Phonetic Spelling
er-IJ-er-on ka-na-DEN-sis
This plant has low severity poison characteristics.
See below
Description

Horseweed is a winter annual in the aster family (Asteraceae). Peak germination is in late autumn and early spring but sporadic germination may occur anytime except summer. It forms a rosette of hairy leaves. In spring, plants bolt upright 3 to 6 feet tall. Individual flowers are small, with white ray flowers and yellow disk flowers.  Do not let plants go to seed in the nursery. Control horseweed around the property to prevent spread. When hand weeding, remove completely as plants can re-sprout from broken stems. Horseweed can be managed by preemergence broadleaf herbicides.

Note: glyphosate-resistant horseweed has been reported in areas where glyphosate-resistant crops are grown.

See this plant in the following landscape:
Cultivars / Varieties:
Tags:
#annual#white flowers#weed#weedy#winter annual weed#daisy-like#countryside#victorian garden#not invasive#arable land#annual weed#cool season weed
 
Cultivars / Varieties:
Tags:
#annual#white flowers#weed#weedy#winter annual weed#daisy-like#countryside#victorian garden#not invasive#arable land#annual weed#cool season weed
  • Attributes:
    Genus:
    Erigeron
    Species:
    canadensis
    Family:
    Asteraceae
    Life Cycle:
    Annual
    Country Or Region Of Origin:
    New World
    Distribution:
    wind
  • Whole Plant Traits:
    Plant Type:
    Annual
    Weed
    Woody Plant Leaf Characteristics:
    Deciduous
    Growth Rate:
    Medium
    Texture:
    Medium
  • Cultural Conditions:
    Light:
    Full sun (6 or more hours of direct sunlight a day)
    Soil pH:
    Acid (<6.0)
    Alkaline (>8.0)
    Neutral (6.0-8.0)
    Soil Drainage:
    Good Drainage
    NC Region:
    Coastal
    Mountains
    Piedmont
  • Flowers:
    Flower Color:
    Cream/Tan
    White
    Flower Inflorescence:
    Head
    Flower Bloom Time:
    Spring
    Summer
    Flower Shape:
    Wheel
    Flower Petals:
    7 - 20 petals/rays
    Flower Size:
    < 1 inch
    Flower Description:
    Pea sized white flowers.
  • Leaves:
    Woody Plant Leaf Characteristics:
    Deciduous
    Leaf Color:
    Green
    Leaf Feel:
    Smooth
    Leaf Type:
    Simple
    Leaf Arrangement:
    Alternate
    Leaf Shape:
    Lanceolate
    Leaf Margin:
    Dentate
    Hairs Present:
    No
    Leaf Length:
    < 1 inch
    Leaf Width:
    < 1 inch
    Leaf Description:
    Leaves form as a basal rosette throughout fall and winter until late spring when plants bolt upright; leaves will become progressively smaller upwards on the stem.
  • Stem:
    Stem Color:
    Brown/Copper
    Green
    Red/Burgundy
    Stem Is Aromatic:
    No
  • Landscape:
    Landscape Location:
    Lawn
    Problems:
    Weedy
  • Poisonous to Humans:
    Poison Severity:
    Low
    Poison Symptoms:
    Mucosal irritation to humans and livestock
    Poison Toxic Principle:
    Tannic acid, gallic acid, volatile oils
    Causes Contact Dermatitis:
    No
    Poison Part:
    Leaves