— Short, snippet-friendly answers to the most-asked questions about Japanese knotweed (Reynoutria japonica). For the full profile with citations, open the main page.
Japanese knotweed (Reynoutria japonica) is a perennial plant native to regions including Amur, China North-Central, China South-Central, China Southeast, Hainan, Japan, Korea, and parts of Russia. Japanese knotweed (Latin: Reynoutria japonica) is an edible plant catalogued in PlantSage.
Japanese knotweed is generally regarded as safe for culinary use when correctly identified and prepared. Avoid wild specimens from polluted ground and confirm species before harvest.
Japanese knotweed is a member native to AMU, CHN, CHC, CHS, CHH, and JAP. Japanese knotweed thrives in moist conditions and prefers light (sandy), medium, or heavy (clay) soils with a pH between 5.5 and 6.5.
Japanese knotweed grows best in USDA zone 4-8, 7/10 light, moist water, and perennial life cycle. Detailed sowing, propagation, and care notes are on the full profile.
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