Just outside of Hot Springs, Arkansas, lies an extraordinary botanical garden. Built on a peninsula on Lake Hamilton, it has everything one expects in a garden of its size—large rose bushes, perfectly manicured tulip beds, a Japanese koi pond, an area dedicated to local flora, and so on. What sets this garden apart is that a large section is left in its natural state. As it is a “woodland garden,” much of the peninsula has been set aside as a nature preserve. It also features numerous architectural features—several beautiful bridges,…