bistorta affinis fleece flower in bloom, beautiful white purple knotweed himalayan persicaria bistort flowering plant in garden

bistorta affinis himalayan bistort persicaria flower white pink purple bloom beautiful ornamental groundcover knotweed fleece cultivated violet erect garden outdoor perennial group flowers bunch bouquet blooming blossom blossoming closeup detail macro daylight outdoors botany botanic botanical flora floral nature growth polygonaceae small summer season stem plant petal bud one covering background