Caulophyllum thalictroides, commonly known as blue cohosh, is a perennial herb that is native to rich, mesic deciduous forests in eastern North America, ranging from Manitoba and Oklahoma east to the Atlantic Ocean. It is often found in the understory of hardwood forests, particularly favoring moist, shaded coves and hillsides with well-drained, fertile soil. Blue cohosh typically grows to a height of 1-3 feet (0.3-0.9 meters) and features compound leaves that are blue-green in color. The plant produces small, yellowish-green to brownish-purple flowers in early spring, which are not particularly showy but are followed by striking blue berries in late summer.

Blue cohosh is valued for its attractive, finely divided foliage and its historical use as a medicinal herb by Native Americans. It is sometimes used in woodland gardens, naturalized areas, or as a component of native plant gardens, where its early-season flowers and late-season berries can provide interest. This plant prefers partial to full shade and moist, well-drained soils rich in organic matter. It is relatively low-maintenance once established but may require additional water during dry periods. Blue cohosh is not commonly affected by serious pests or diseases, but it should not be consumed as it contains several toxic compounds. It is also important to note that while it has been used medicinally, it should not be used without the guidance of a healthcare professional due to its potent active ingredients.CC BY-SA 4.0