Plant of the week: Allium 'Mount Everest'

Tall, pompom-like alliums are a brilliantly sculptural late spring flower, bridging the gap between early spring bulbs and summer exuberance. 'Mount Everest' produces big, white, perfectly round heads of flowers, like oversized dandelion clocks. Buy three bulbs for £9.95 or six for £16.90 (prices include UK mainland p&p). To order, call 0330 333 6851, quoting ref GUPW295, or visit our Reader Offers page . Delivery from mid-September.