OF THE 1,400 species of solanums – among them climbers, trees and shrubs – the stunning ornamental potato vine has to be the favourite with British gardeners. A relative of potatoes, aubergines and tomatoes, as well as the deadly nightshade weed, it is prized for its beautiful, exotic and sweetly scented starry flowers. Then, of course, there is the fact that, unlike many frost sensitive members of this tropical family from South America, it is tough enough to survive our temperate climate.
Most widely grown are the purple flowered Solanum crispum and its cultivar ‘Glasnevin’ (also known as Solanum crispum ‘Autumnale’) and the white flowering Solanum laxum ‘Album’. Both have fragrant flowers, produced in large clusters throughout summer, which are followed by inedible, but attractive, berries held on a vigorous…