erigeron canadensis conyza canadensis known as horseweed

background beautiful blue bright butterweed called canadensis canadian closeup colorful coltstail conyza erigeron fall fleabane flora floral flower fresh grass green growing herb herbaceous horseweed inflorescence koniza landscape love macro marestail medicinal natural nature ostudnika outdoors pattern people plant pochechuynaya ruderal season seeds siberia single summer therapeutic weed wild yellow