Allium, Serendipity Ornamental OnionSerendipity Ornamental Onion is a clumping herbaceous perennial with spreading blue tinted grass like foliage. Sturdy upright stems sport fragrant global clusters of rosy purple flowers at the ends that bloom in mid summer. Grows best with light afternoon shade in the South and dry to medium well drained soils. When crushed the foliage smells like onion. Type: Perennial Height: 1. 5' 2' Spread: 1' 1. 5' Spacing: 1' USDA Hardiness Zone: 4 8 Culture: