A flower and leaves of a Pink Knotweed (Persicaria capitata), an ornamental plant native to Asia. It is a prostrate herb with leaves that are 1–6 cm (0.4–2.4 in) long and 7–30 mm (0.3–1.2 in) wide, and spikes that are 5–10 mm (0.2–0.4 in) long and 5–7 mm (0.2–0.3 in) in diameter.Photo: Noodle snacks