White Deadnettle, Weiße Taubnessel, Lamium album.
Leaves are triangular with a rounded base, softly hairy, and with a serrated margin; flowers are white, produced in whorls on the upper part of the stem.
Lamium album (White Deadnettle) is a flowering plant in the family Lamiaceae, native throughout Europe and western Asia, growing in a variety of habitats from open grassland to woodland, generally on moist, fertile soils.