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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.Flower May - July (in south); July - August (in north)Habitat Open, well-drained sites: prairies, open woodlands, forest clearings, stream banks, shore l
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