Allium Big Impact Mixed is perfect for adding height and structure to your borders with these superb summer-flowering bulbs. They are undemanding and easy to grow, Allium \'Big Impact Mixed\' will provide a wonderful assortment of flowers with different shapes, sizes and colours that are superb for cut flower displays.Remember though that their attractive and architectural seed heads will also provide autumnal interest later in the season. Height ranges from: 60 -90cm (24-36). Spread: 15cm (6).