It’s a peculiar rite of modern homeownership: Plant a tulip bulb in autumn, cage or spray it to deter nibblers, admire its fleeting blooms a few months later, let it rot in soil ill-suited to its needs and repeat the whole cycle again the following year.

A humane backyard is a safe haven for wildlife—a space where animals can thrive free from pesticides, trapping and other threats.

They were like moths to a flame or, more accurately, butterflies to a native plant. No sooner had I unloaded two joe-pye weed perennials from my car last August than three tiger swallowtails dive-bombed the pots, as if to validate my purchase. If only my fellow shoppers knew what they were missing...