pale smartweed plant flowers on blue sky background

agriculture blossom botany bunch flowers flower flowering plant garden grass growth herb inflorescence leaf meadow nature plant blue sky background bloom blooming botanic botanical crown flower curlytop knotweed dockweed smartweed flora floral foliage green herbal leaves pale pale persicaria pale smartweed park persicaria persicaria lapathifolia pink polygonaceae polygonaceae family polygonum polygonum lapathifolium smartweed species weed white flower wild willow weed