Purple Loosestrife (Lythrum salicaria) Purple Loosestrife (Lythrum salicaria) Non-native RangeBlooms: July - SeptemberHabitat: These flowers prefer sun and moist soil. Looks for them in fens, marshes, borders of ponds and rivers, and ditches. Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook