It is a deciduous shrub 50-150 cm tall, forming a thick understory in forests, spreading by underground stolons. The leaves are 3-5 cm long and 1-2 cm broad, bluish green, and hairless or with scattered glandular hairs. The fragrant flowers are 3-4 cm long, usually white to pink, sometimes with a bit of yellow; they are produced in trusses of 4-10 together.
Cultivation and uses
It is not widely cultivated in North America, but has been introduced and is popular in England. In the U.S. it is regarded as a good plant for heavy soils, but will spread itself too freely if planted in sandy soils.