Species such as kudzu, Japanese honeysuckle and multiflora rose have damaged natural ecosystems. Kudzu and other invasive weeds pose a significant threat to the biodiversity in the southeast. Nodes and crowns are the source of all kudzu vines, and roots cannot produce vines. The best known is kudzu, also called Japanese arrowroot. Only killing or removing the kudzu root crown and all rooting runners is needed. Among these plants are "Pueraria mirifica", kudzu, angelica, fennel, and anise. Roots, flowers, and leaves of kudzu show antioxidant activity that suggests food uses. The cultivation covered over one million acres of kudzu. A different and less time-consuming option for the control of kudzu is treatment with herbicides. By 1946, it was estimated that of kudzu had been planted. A different survey found twenty-five different species of insect feeding on the kudzu. Another way to control kudzu is goats and sheep. This makes it necessary to place kudzu hay under sheltered protection after being baled. Kudzu fiber has long been used for fiber art and basketry. Buried crowns can regenerate into healthy kudzu.