Lemon-scented verbena: Also known as Aloysia, this is a must-have if you enjoy drinking deliciously refreshing lemony tea. A delightful drink is easily made from the scented leaves or you could use them to add fragrance to the garden. If you locate the plant close to a path, the lemony scent will be released whenever a person brushes past the leaves. This rather wispy looking shrub can reach up to 2m in ideal conditions, but normally about 1m tall in areas of light to moderate frost as it can survive a little icy chill. Prune back every spring if you prefer a dense, bushy plant. It is easy to grow and the sprays of white flowers it bears are a bonus.