‘Windy City’ Ornamental Onion is a showy introduction by Brent Horvath and Intrinsic Perennial Gardens. The globular dark purple flowers are held above the green flat leaves on 18” sturdy green stems in mid summer. The seedheads turn tan in the fall and persist well into winter. They make an attractive addition to dried arrangements. Allium x ‘Windy City’ is a good addition to green roofs, sunny balconies and well drained sunny perennial gardens.