Some kinds make small trees, but Corylopsis pauciflora is a shrub, 4 to 6 ft. high, with clusters of primrose-yellow, pleasantly scentedin March. It does best on lime-free soils and as a rule requires no . Larger kinds are C. glabrescens, C. spicata and C. willmottiae, all with primrose-yellow flowers produced in little dangling chains along the bare in early spring.
Corylopsis is indigenous in China, Japan and Korea, and comprises winter-hardy, early flowering, ornamental shrubs. In contrast with Corylus, hazel, it does not bear catkins or fruit, though theare similar. This is a deciduous shrub with slender, spreading branches, broad, oval or round, pointed, bristly-toothed which turn a beautiful colour in autumn, and have a heart-shaped base, and pendent clusters of just a few or large numbers of yellow, bell-shaped flowers which appear before the leaves.
C. pauciflora is up to 1.5 m tall and flowers profusely. It has slender, oval, pointed, bright green leaves up to 5 cm long, greyish or bluish-green on the underside and turning golden-yellow in autumn, and fragrant, pale yellow flowers in of two or three. C. spicata is 1-2 m tall, with zig-zagging branches, thick shoots, oval, shield-shaped, metallic green leaves, 5-10 cm long, and narrow clusters of 7-10 fragrant, pale yellowish-green flowers with protruding red anthers. This plant is not suitable for a clay soil.
Plant in a sunny or slightly shaded spot, sheltered from the wind, in well-drained soil, rich in humus and poor in lime. It does not need, but can be thinned out and rejuvenated by removing dead wood. Propagate by and from summer .