'Gardener's World' comes to us from the garden of Christine Stott at Buckinghamshire, England. Its name is that of the popular magazine and BBC TV program, which featured it as a study of how a new plant enters the market, from discovery to promotional launch. Formerly Coronaria tomentosa, the straight species has high-wattage magenta flowers and an unfortunate tendency to self-sow in the garden. 'Gardener's World' represents tremendous improvements on both scores: The flower is larger, with a far more refined and attractive color, and it is sterile. It will bloom where it's planted - period.