As the Silverbush (Convolvulus Cneorum) proves, you don’t need bright blooms to make a statement. This compact shrub, which can typically grow up to 2 feet tall and 3 feet wide, offers plenty of visual intrigue with its trumpeted flowers. “The leaves provide a lovely contrast to the green shades of other garden plants, to get the very best out of both,” Dickson says.  “It shows good drought tolerance, so is perfect for patio containers or as a focal point in small borders or dots planted in larger schemes.”  The only drawback to this shrub is it’s not fully frost-hardy, so it’s best to place it in a sunny, sheltered spot so it can survive the winter.