purple tansy or phacelia tanacetifolia also known as scorpionweed or heliotrope growing in field as cover crop

purple tansy phacelia scorpionweed heliotrope grow field crop flora people bloom lacy tanacetifolia blue farm botany agronomy control care plant flower blossom agricultural agriculture farmland cultivation cultivated plantation countryside covercrop beeplant manure green ornamental herb herbaceous annual growing cover selective focus