Aquilegia vulgaris 'William Guinness' is a striking variety of Columbine. From the shape of its flowers, it is easy to see why it is sometimes dubbed 'Granny's Bonnet', although the black blooms with white corolla are certainly more fashionable than the average pensioner's headwear! Indeed, these unusual colours give the plant the alternative name of Aquilegia 'Magpie' and you will certainly want to collect several of these hardy perennials which are attractive to beneficial garden insects such as bees and butterflies. After it has flowered in the late spring, the green foliage and appealing seedheads of Aquilegia 'William Guinness' remain an attractive addition to sunny or partially shady gardens throughout the season.