Boxwood has been long used as a decorative pruned hedge in formal gardens, but it's also beautiful when less strictly maintained. Allowed to grow freely, some varieties can reach 20 feet tall. Many people think of boxwood as a deep green plant, but there are also beautiful white variegated and gold varieties. Grown as a fence or in containers, it will provide rich scenery and a lush, living wall to protect your yard from prying eyes. Available at The Home Depot; $34.99.