blooming allium blue on background salvia nemorosa caradonna in a summer garden

alliaceae allium background ball beauty bloom blooming blue blur border botanical botany bulb bulbous caeruleum caradonna circle depth edible exterior field flora floral flower flowers focus garden gardening globular green growth herbaceous high horticulture nature nemorosa onion ornamental perennial petals plant round sage salvia season selective shallow shape spring stem summer tall