a field of phacelia growing on a farm in the uk. also yellow mustard. phacelia is used by farmers as a green manure and as a brood

insects yellow mustard dense summer sunshine sunny blue sky field view nitrogen leaching soil improving annual green manure arable uk farming environment ecology meadow rural landscape cover crop biomass forage source flower lacy phacelia tanacetifolia purple tansy violet flowers dark background agriculture bumblebee animal plant closeup blooming tansyleaf food nectar nature blossom macro europe insect botanical