American black walnut is a classic for those who love scrumptiously elegant deep-colored woods. Prized for its handsome dark looks, walnut hardwood flooring has found its place in some of the best homes in Europe and North America. Walnut is harder than most American hardwoods but softer and easier to work with than most exotic species. Yet walnut hardwood flooring offers you all of the naturally deep and rich tones of the exotics. Most walnut planks feature a straight grain but there is a wide variation between boards, some featuring grain with gentle curves and waves.