Fallopia baldschuanica

Fallopia baldschuanica (syn. Polygonum baldschuanicum) is an Asian species of flowering plant in the knotweed family known by several common names, including Russian-vine, Bukhara fleeceflower, Chinese fleecevine, mile-a-minute and silver lace vine. It is native to Asia (China, Russia, Kazakhstan, etc.), and is growing wild in parts of Europe and North and Central America as an introduced species. Some authors split the species in two, referring to the Chinese populations as Fallopia aubertii and the Russian and Central Asian species as F. baldschuanica. Fallopia baldschuanica is grown as an ornamental plant for its flower-laced vines. The white flowers are decorative and provide nectar and pollen for the honey bee. As it is fast-growing, it is used as cover for unsightly fences and other garden structures. It can become invasive, however.

from Wikipedia