Setaria verticillata aka Bristle Pigeon Grass

Setaria verticillata, also known as hooked bristlegrass, rough bristle-grass, and bristly foxtail, is a hardy bunchgrass that is native to Europe but has become an introduced species and noxious weed on most continents. It grows up to a meter long with decumbent or erect stems and leaf blades up to 25 centimeters long with a long sheath around the stem. The inflorescence is a dense panicle up to 15 centimeters long that tapers at both ends and contains many small spikelets and bristles. These bristles have tiny backwards-pointing barbs that help them hook onto clothing or animal fur, facilitating their dispersal. Setaria verticillata is a weed of many types of agricultural crops, growing in vineyards and fields, and herbicide-resistant strains have been noted. It is imperative to remove the plant from the area if there is any evidence of flowering, as seeds can mature even if the plant itself is killed. While seeds of the plant have been used as a famine food in India and to make beer in South Africa and porridge in Namibia, the plant might be poisonous. Hooked Bristlegrass is also a rare houseplant that needs regular watering and direct light, less than a foot from a window, and likes well-draining soil supplemented with a gentle, organic fertilizer during the peak growing season.