Chimonanthus praecox (wintersweet)

Native to China (from eastern Sichuan and Hubei to Zhejiang), where it occurs in montane forests, at 500–1,100 m above sea level. It is also widely planted as an ornamental in China and many other temperate areas.

A deciduous shrub (or sometimes with persistent leaves), up to 3 m high and wide (up to 13 m tall in the wild), with rough, opposite, dark green leaves and small, solitary, highly scented, yellowish flowers borne on short stalks in winter and spring before the leaves appear. The outer petals (tepals) are waxy, almost transparent, in appearance, while the inner tepals are smaller and usually purplish. The flowers are beetle-pollinated.

Named cultivars include Chimonanthus praecox ‘Luteus’, which has slightly larger flowers and yellow inner tepals, and C. praecox ‘Grandiflorus’, a larger shrub, with bigger leaves and larger, but less strongly scented, pure yellow flowers, with red-stained inner tepals. Both cultivars have been presented with an Award of Garden Merit by the Royal Horticultural Society.

In 2005, the  IUCN-SSC Chinese Plant Specialist Group listed Chimonanthus praecox as Vulnerable according to IUCN Red List criteria. The main threat to wild populations is forest clearance and the resulting fragmentation of populations. As a result of the long history of cultivation of this species, a large number of wintersweet cultivars are grown in China, although many remain unnamed. DNA-marker technology is now being used in China to try to improve the understanding and management of the genetic diversity of wintersweet germplasm resources there.

Owing to its sweetly fragrant flowers, wintersweet is one of the most popularly planted ornamentals in temperate China, and is widely cultivated in temperate areas elsewhere. The flowers are used as a folk medicine in China for treating measles, coughs, tonsillitis and pharyngitis. Much scientific research has been undertaken, especially in China, on the medicinal (especially anti-fungal) properties of Chimonanthus praecox. Its essential oils are used in cosmetics, perfumery and aromatherapy. The flowers are used to flavour herbal teas, and are also added to potpourri mixtures. In China, wintersweet has long been used to scent linen, in the way that lavender has been used elsewhere.

Kew's Millennium Seed Bank Partnership aims to save plant life world wide, focusing on plants under threat and those of most use in the future. Seeds are dried, packaged and stored at a sub-zero temperature in our seed bank vault.

Description of seeds: Average 1,000 seed weight = 127.5 g.
Number of seed collections stored in the Millennium Seed Bank: One.

Wintersweet grows well in a sheltered position, particularly against a warm wall in full sun or in a sunny place on the edge of woodland in warm climates, in moist, but well-drained soil. It can be grown in most soils, but does best on chalky ones. It usually develops into a lax, untidy shrub. It is quite slow to flower (plants grown from seed can take 12–14 years to produce flowers), and should be pruned only very lightly, immediately after flowering. It is best grown from seed. Branches close to the ground can also be layered in late summer, although root formation may take up to two years.

At Kew, wintersweet can be seen growing in the Winter Garden (near the Ice House, adjacent to the Princess of Wales Conservatory). This shrub is pruned to shape in early spring after flowering. Chimonanthus praecox ‘Luteus’ can be seen growing on the outside wall of the Duke’s Garden.

Both pressed and dried and alcohol-preserved specimens of Chimonanthus praecox are held in Kew’s Herbarium, where they are available to researchers by appointment. The details of some of these specimens, including images, can be seen on-line in the Herbarium Catalogue.

Search Kew's databases for more information on this species

Royal Horticultural Society Plant Selector – Chimonanthus praecox

BBC Plant finder - wintersweet

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