The vision of a garden shared peacefully by humans and animals is a familiar, but elusive, landscape trope. Whether threatened by habitat destruction or climate change, displaced by urbanization or invasive species, poisoned by industrial toxins, or hunted to extinction, many wild animals have failed to thrive in the company of people. There is growing scientific consensus that we are in the midst of the sixth great extinction in earth history and the first caused by human activities.

What agency can landscape architects and garden designers have in conserving or restoring wildlife...