. "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 Summer, May to September.Flower May - September (in south); June - July (in north)Habitat Moist areas, meadows, and prairies.Range Western half of North America, east to" . . .