amaranthus retroflexus smooth pigweed flowers. the flowers are small, green, and spiky

garden background closeup medicine nature green pigweed plant herb amaranth growth food vegetable leaf color edible weed alternative cereal bloom blitum beautiful amarantos blossom foliage field retroflexus wild tumbleweed thotakura summer spring smooth seed redroot flower pseudocereal natural motherwort medicinal macro invasive crop wildflower botanical damage vegetarian