The black walnut (Juglans nigra) is a deciduous tree native to North America, known for its dark, rich wood and edible nuts. It can grow up to 100 feet tall and has a broad, rounded crown. The tree produces green, round fruit that contains a hard-shelled nut, which is highly valued for its flavor and nutritional benefits. Black walnut wood is prized in furniture making and cabinetry due to its strength and beautiful grain. The tree's bark and leaves contain compounds that can inhibit the growth of some plants, a phenomenon known as allelopathy, making it a unique addition to various ecosystems.