salvia nemorosa 'ostfriesland' blooms with blue-violet flowers in a flower bed in july. potsdam, germany

'ostfriesland' gardening background balkan clary beautiful bloom blooming blossom blue sage botanical botany bush butterfly closeup color colorful design flora floral flower fresh garden germany grass green hardy flowering herbaceous perennial plant landscape large-flowered selfheal leaf macro natural nature outdoor petal petals pink purple salvia nemorosa season seasonal species streaks summer woodland violet wild plants germany blooms blue-violet flowers bed july cleary plant potsdam