OUT OF EDEN WALK

Anyone who’s knocked about Japan a bit knows that gardens—both ornamental and vegetable—provide an elegant accent to the country’s landscapes.

Whether they include ancient, painstakingly trimmed bonsai trees or just this month’s onion crop, Japanese gardens adhere to a rigorous sense of order that was already being codified in writing nearly a thousand years ago. They mix philosophy with peat, mulch with meditation. Austere, mysterious, simple, and still, Japanese garden design balances a respect for nature’s wildness with human control. The results of all this meticulous spade and rake work can appear as striking as painting or sculpture.

Yet how to protect such earthy masterpieces from “art thieves”? That is, from hungry moles, mice, foxes, racoon dogs, and other raiders that can turn a placid Zen garden into a chaotic crime scene overnight?

In Japan, the solution is as beautiful and savvy as the gardens themselves: whirligigs.

Walking in rural Japan, it’s impossible to miss them—colorful, toy-like contraptions that protect many a front-yard flower plot and cultivated cabbage field. Handmade from old plastic bottles and even discarded beer cans, these ingenious spinning devices whir in the slightest breeze—a testament to the finely tuned balance of their propellers. That they’re recycled from rubbish only adds to their virtue.

Whirling atop metal rods or lengths of bamboo, I assumed the profusion of pinwheels were meant to shoo birds away. An elderly gardener in Nagano prefecture set me straight. Glittering metallic tape strung over gardens served that purpose, she said. But the whirligigs operated more subtly.

“Spinning sends vibrations into the soil,” she explained, pointing to the ground. “It scares the animals away.”

Puffs of wind crank the tiny airfoils. These revolutions transmit erratic and startling micro-tremors underfoot. In a land haunted by earthquakes, what garden pest wouldn’t feel anxious and flee?

My favorite garden vibration system was even simpler: a collection of aluminum beer cans and coffee bottles upended on poles of rebar. Their movements on a windy afternoon added a pleasant, tinkling soundtrack to a few anonymous furrows of onions. For any underground mice or moles, though, they must have sounded a dirge.