a big bright purple spheric flower also known as `echinops ritro`

big bright purple spheric flower also known as echinops ritro ball botany shape spherical unique structural echinop flora nature summer violet season perennial decorative sphere thistle blue botanical head stem blooming pollen meadow thorny field sunny day pharmacy honey inflorescence circle gardening wild growth giant fluffy herb colorful sharp herbal thorn spiky wildflower herbaceous asteraceae gathering