Ornamental onions, or alliums, get the summer show off to a bold start when their flower globes open in May. Like giant lollipops, the spherical structure of these bulbous perennials adds solidity and drama to borders during what is often a flowering lull between spring and summer. Drought-tolerant and full of nectar for wildlife, they are also perfect plants for the modern garden.
‘Alliums are incredibly perennial and flower for ages,’ says
