many puprle loosetrife flowers on the side of a pool - lythrum salicaria

astringent background belgium blooming bog border botanical botany brown cultivar decorative diarrhea dysentry embankment flanders flemish flora floral flower flowering flowers focus garden herb invasive kalkense lake loosetrife lythraceae lythrum many marsh medicinal medicine meersen natural nature ornamental plant pond pool puprle reed salicaria selective side water waterplant waterside wild wildflower wildflowers