TONY BULLARD/Special ContributorJoanne Pospisil's garden in Carrollton has been certified as a wildlife habitat. Her koi pond will be featured on the Koi and Water Garden Club of North Texas' annual pond tour.

Here, in her garden, on a teak bench amid the natural world and greenery, she's in a world apart from her suburban Carrollton neighborhood and her job as regional marketing manager for an insurance company.

From her outdoor living room, Ms. Pospisil talks passionately about the yin and yang of water gardening. A sort of new age music emanates softly from unseen speakers. She strokes one of her two cocker spaniels, which shares the bench with her. The other stands at the edge of the pond above the swimming koi.

Her private garden has been certified by the National Wildlife Federation as a wildlife habitat. The criteria include providing food, water and shelter for wildlife along with a place for them to nurture their young.

For people like Ms. Pospisil, beauty lies in the pond's clarity. The balance of sun exposure, quantity of fish, plant material and oxygenation keeps the water perfectly clear. Any imbalance turns it green or murky.

And when there's balance, there's no maintenance except for once every two years, when she has a company move the fish into a holding tank, pump out the pond water and power-wash the rocks where the water lilies grow.

As she talks, a bird clings to one of the many wooden houses attached to her fence, feeding its young, protected beneath the lush canopy of a redbud tree.

Koi, a symbol of prosperity and good fortune in Japan, are also prolific. Ms. Pospisil has raised four generations in the seven years since she designed and had her garden installed.

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