Seed, Cutting - softwood, Cutting - hardwood, Air Layering, Suckers
Seed - best sown as soon as it is ripe in a sheltered position outdoors or in a cold frame. Sow stored seed in February in a greenhouse, seeds can be cold-treated before sowing in spring, but will germinate rapidly. Germination usually takes place within 6 weeks. Prick out the seedlings into individual pots as soon as they are large enough to handle. If well grown, these seedling can be large enough to plant out in the summer, but give them some protection in their first winter. Otherwise plant them out in late spring of the following year
Cuttings of half-ripe wood, July/August in a frame. Easy
Hardwood cuttings in winter, cuttings root slowly. Cuttings of mature wood of the current year's growth, November in a cold frame.
Named cultivars are propagated by or air layering in late spring or in autumn. This is a sure and easy method, though it takes 12 months.
Clumps may be propagated through division.
Named hybrids are often propagated through grafting.