semi-evergreen plant red bistort persicaria bistorta `superbum` with dense spikes of small light pink flowers in summer with

adderwortel attractive beautiful bed bistort bistorta bloom blooming blossom botanic botany bottlebrush closeup color cultivar decorative dense easterledges flora floral flowering flowers foliage garden gardening knotweed leafless leaves light macro nature officinalis ornamental outdoors persicaria pink polygonum red small snakeroot spikes spring stem summer superbum tiny variety