Tannin is another chemical component of black haw. The primary use of black haw today is to prevent menstrual cramps. Haw Creek was so named on account of black haw timber in the area. The salicin in black haw may also be of use in pain relief. Black Hole Creek was originally known as Black Haw Creek. Those who are allergic to that substance should not use black haw. Consequently, pregnant women should not use black haw in the first two trimesters. For centuries, black haw has been used for medical purposes, mainly for gynecological conditions. Wherever it lives, black haw prefers sunny woodland with well-drained soil and adequate water.