Fallopia sachalinensis - giant knotweed
Plants from at least ten of the genera in the knotweed (Polygonaceae) family can be successfully grown in Finland. They include buckwheat (Fagopyrum esculentum), several so-called weeds, and others used as perennial garden plants. The giant knotweed, formerly known by the scientific name Polygonum sachalinense, is the biggest of these, capable of reaching heights of 3 metres in a single summer.