flower of the blue billygoat-weed, bluemink, flossflower or blue danube - ageratum houstonianum - in summer, bavaria, germany

ageratum arboretum bavaria beautiful beauty billygoatweed bloom blooming blossom blue bluemink blueweed botanic botanical botany bright bush closeup colorful danube decorative european flora floral floss flossflower flower fluffy fresh garden gardening genuine germany green hairy houstonianum leaf lovely natural nature nice ornamental outdoor park perennial petal petals plant pollen purple summer violet