Species of Viburnum native to northern North America. Closely related to the European and Asian Viburnum opulus and often treated as a variety it. Hardy deciduous shrub to 3m. Suitable for most soil types and enjoys some moisture but is drought hardy once established. Full sun or part shade. Beautiful blossoms in spring and stunning autumn leaf colour. The fruits are very acidic, though better after a frost, but are rich in Vitamin C and are excellent added to jams etc. Both Viburnum trilobum and V. opulus are known as ‘crampbark’ and have been used medicinally in their respective native areas. The bark is collected in the early spring or late autumn and dried in pieces or immediately tinctured. Crampbark is known best for its antispasmodic effect on muscle groups. It has a special affinity for the uterus and is therefore often given for menstrual cramps, to prevent miscarriage or to alleviate afterbirth pains. It can be equally effective for arthritis, asthma or back pain for both men and women.