blue tansy cover crop field bloom phacelia tanacetifolia buckwheat fagopyrum esculentum plant lacy purple detail farmed

cover crop blue tansy lacy phacelia plant green field buckwheat bloom fagopyrum esculentum tanacetifolia common farmed purple crops grown fodder bee fertilizer honeybee catch suppress weeds improve soil quality plants detail closeup herbicidesensitive ecology blossom ecological flowers medicinal flower europe agriculture organic farming bio herbicide sensitive polistes bumblebee nature