Black walnuts are a type of tree nut native to North America, known for their rich, earthy flavor and hard shell. They grow in clusters and are encased in a green, fleshy husk that turns black as it ripens. The nuts are typically harvested in the fall and are often used in baking, cooking, and as a snack. The black walnut tree can reach heights of up to 100 feet and is valued for its strong, durable wood. Unlike English walnuts, black walnuts have a more intense taste and are often considered more nutritious, containing higher levels of antioxidants and healthy fats.