I have some friends getting married who are moving into a new house with a fairly empty garden. They like plants and I'd like to get them something special.
They are fully hardy, and will grow best in full sun with fertile well drained soil. Improve vigour and flowering by thinning out old shoots after flowering.
You can propagate by softwood cuttings in the summer or by seeds in the autumn.
Pests, diseases or disorders
Chlorosis may be a problem on shallow, chalky soil.