Its easy to see why this allium is named 39globemaster39 its spectacular spherical blooms made up of dozens of lilac flowers can grow up to 15cm 4063441 in diameter although they only appear once a season in june or july the skeleton45like seedheads which follow are equally breathtaking this beauty along with ornamental onions39 undemanding nature makes the hardy bulb well deserving of its rhs award of garden merit 40agm41 height 80cm 4023973441