Allium Globemaster This unique allium boasts hundreds of starry lilac-purple blooms that form the incredible flower heads of this RHS AGM variety. The magnificent, spherical blooms are up to 15cm (6) across, so you can see the purple petals from miles away! Flowering only once in a season, the blooms are followed by skeletal seedheads for a beautiful, floral autumn display. Undemanding and easy to grow, these purple alliums are a great way to add the \'wow\' factor to borders and cut flower arrangements indoors. Height: 80cm (31). Spread: 15cm (6).