Plant of the week: Delphinium 'Black Knight'

Every delphinium strikes an impressive pose in the garden, but 'Black Knight' has deep purple towering flowers up to 6ft high. Grow in rich soil, in a sunny border, and protect young growth from slugs. Buy five jumbo plug plants of Black Knight Delphiniums for £8.95, or 15 for £17.90 (prices include UK mainland p&p). To order, call 0330 333 6851 quoting ref GUPW240, or visit our Readers' Offer page . Delivery within 28 days.