San Diego Zoo was founded in 1916 by Dr Harry Wegeforth and is 100 acres. There is a Bromeliad Garden, Variegated Garden, Ginger Garden and Bog Garden. Once a month the zoo holds a plant day that includes a free botanically oriented bus tour guided by different members of their horticultural department.
2920 Zoo Drive, Balboa Park, San Diego, California, USA, CA 92101
See San Diego Zoo Gardens website for details:-