L. Allen Smith is an American horticulturist, author, and television personality known for his expertise in gardening and landscape design. He has written several books on gardening and has appeared on various television programs, sharing his knowledge and passion for plants and outdoor spaces. Smith is also recognized for his work in promoting sustainable gardening practices and has contributed to numerous gardening publications. His engaging style and practical advice have made him a popular figure among gardening enthusiasts and homeowners looking to enhance their outdoor environments.