The name Onion might conjure up an image of a plain, brown sphere, but this ornamental plant is far from bland. Allium ‘Gladiator’ flowers once a season in the early summer. However, its large, orb-like heads made up of many purple blooms are sure to leave a lasting impression, not least because they transform into dramatic seedhead clusters in the late summer and autumn. The hardy bulb is an excellent, low maintenance addition to borders and cut flower gardens, for its blooms make a stunning centrepiece to any display. Height: 1.2m (4’0); Spread: 15cm (6).