single ornamental onion or allium bulbous herb monocotyledonous plant with round flower head composed of dozens of starting to

single ornamental onion allium herbaceous geophyte perennial bulbous herb monocotyledonous flowering plant flower forms umbel top leafless stalk shape round head composed dozens starting open blooming star shaped light purple flowers growing urban home garden warm sunny summer day spring nature flora bud bloom macro blossom closeup beauty floral