16-20" tall x 10-14" wide. The 2018 Perennial Plant of the Year, ‘Millenium’ Allium is celebrated for its long bloom time and stunning flowers. A compact grower that’s perfect for border plantings, ‘Millenium’s rose-purple blooms are perfect 2” spheres that attract throngs of butterflies and bees to their rich nectar. Deer and rabbit resistant and tolerant of both drought and dry soils, alliums are easy growers that are used to add visual interest to beds. Container-friendly.