Seedling [Top]
Stem [Top]
Leaf margin [Top]
Inflorescence [Top]
Flower heads [Top]
Flower head [Top]
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American burnweed (Asteraceae) is a native, summer annual weed. Seedlings have elliptic leaves with finely toothed margins; midveins are often tinged red. As plants mature they grow 5 to 8 feet in height, with toothed leaves clasping the stem. Flowers lack petals but are white or cream-colored. Seeds are in small, dandelion-like globes and are dispersed by wind. Flower heads of American burnweed are held upright, whereas thickhead flowers droop downward. Plants flower in summer to early fall then die after frost. Seeds are wind dispersed and can produce multiple generations each growing season. American burnweed is well controlled by broad-spectrum nursery herbicides but most single-active ingredient herbicides are less effective. [TOP]