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| - Toxicity can vary in a plant according to season, the plant???s different parts, and its stage of growth; and plants can absorb toxic substances, such as herbicides, pesticides, and pollutants from the water, air, and soil.Flower May to September.Habitat Dry sites: fields, roadsides, railway lines, waste places, and other disturbed areas; to 6000 ft (1800 m); also cultivated as an ornamental.Range
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