purple loosetrife flowers, in a marsh landscape in kalkense meersen nature reserve, flanders

astringent background belgium blooming bog border botanical botany brown countryside cultivar decorative diarrhea dysentry embankment estuary field flanders flemish flood flooding flora floral flower flowering flowers herb hike hiking invasive lake landscape loosetrife lythraceae lythrum marsh meadow medicinal medicine nature ornamental pastoral peat plan plant polder polders protection purple reserve river rural safety salicaria scheldt side sigma sigmaplan summer summertime sunny tourism tourist trees waterplant wetland wild wildflower wildflowers