What is the Scottsdale Xeriscape Garden?
It is a public garden built on top of several million gallons of drinking water, wrapped around a water treatment plant, and designed to talk you out of your lawn.
The Scottsdale Xeriscape Garden occupies about six acres on the west side of Chaparral Park, at 8111 E. McDonald Drive, between the off-leash dog park and the softball fields. Inside it: more than 7,000 Arizona-friendly plants from roughly 200 species, arranged in beds and terraces with signs that name each plant and explain the principle it is demonstrating — plant selection, proper installation, rainwater harvesting, pruning that does not amount to vandalism. It is run by Scottsdale Water, not the parks department, because the point is not decoration. The point is to show homeowners, landscapers and skeptics what desert-adapted planting actually looks like when it is done well.
The design does real work. Curving gabion walls — wire baskets packed with river rock — slow storm runoff so rain soaks into the beds instead of the street. Red shade sails and mesquites make shade where the site had none. An oversized rusted-steel vessel brims with water at the entrance, inscribed with the line The frog does not drink up the pond in which he lives. And the 320-foot wall of the Chaparral Water Treatment Plant behind it all gets absorbed into the composition by steel panels, terracing and palo verdes, while the garden’s own ground plane quietly conceals the plant’s buried finished-water reservoir.
It opened in 2008, it is free, it is open sunrise to 10:30 p.m., and it is a National Wildlife Federation Certified Wildlife Habitat. Most visitors come for twenty minutes and leave with a phone full of photographed plant labels.
How to do the garden right
Treat it as a shopping list, not a sightseeing stop. The garden’s superpower is its signage. Walk the paths, photograph the label of every plant you find yourself liking, and you leave with a shortlist that is already proven to survive a Scottsdale summer at this elevation and exposure — which is worth more than any nursery conversation. Locals who are about to re-landscape come here first on purpose.
Season and hour. March and April are peak color; the cactus bloom follows in May. October and November matter for a different reason: that is when low-desert planting season opens, so seeing the garden then is seeing it right before you can act on it. In summer, come at sunrise, be done by eight, and appreciate that the shade sails are load-bearing. Camelback Mountain sits right behind the garden to the southwest, which makes early light the flattering light.
Park in the right lot. The Hayden Road lot just south of McDonald Drive, beside the dog park, puts you at the garden’s paths in thirty steps. The big main Chaparral lot off Hayden farther north works but adds walking, and on weekend mornings it is contending with dog park traffic, ballfield parents and the lake loop crowd all at once.
Bring the dog, or don’t. Leashed dogs are welcome on the paths and the off-leash park is next door, so the two-stop morning is standard practice. If your dog cannot walk past a cactus without investigating it, though, do the garden alone — cholla and teddy-bear cholla are doing exactly what they are supposed to do here.
Stack it with the neighborhood. The garden is a twenty-minute stop, so pair it: the lake, the inclusive playground and the aquatic center at Chaparral Park next door; the Arizona Canal path just north for a ride; Camelback Park and Indian School Park south on the same Greenbelt run. Families who want water rather than plants should simply go to Chaparral’s lake first and treat the garden as the cool-down.
Take the free tour if you can. Scottsdale Water runs guided garden tours and landscape workshops through the cooler months, and an hour with someone who knows why each bed is planted the way it is will change how you look at your own yard. Check the city’s water education pages for current dates rather than showing up hopeful.
How a water treatment plant became a garden
The story starts with a flood plain and a slogan. Chaparral Park exists because Scottsdale refused to let the Army Corps pour the Indian Bend Wash into a concrete flood channel, choosing instead the Greenbelt — parks, lakes and golf built to flood on purpose. By the 1970s the wash at Hayden and McDonald had become a hundred acres of lawn and lake. It was, and is, a monument to water used generously.
Then the arithmetic changed. The Groundwater Management Act of 1980 forced Arizona developers to prove a hundred-year water supply, and by 1982 Scottsdale had a standing Water Conservation Office running rebates and education. The city spent the next two decades building the machinery of a desert utility that takes conservation seriously: reclaimed water for golf courses from 1993, saving something like a billion gallons of groundwater a year, and the $116 million Water Campus in 1998–99, at the time the largest public works project in city history.
By the 2000s Scottsdale needed more treatment capacity for Colorado River water arriving by canal, and the obvious site was the least convenient one: the middle of a beloved neighborhood park, right beside the Arizona Canal that would feed it. Building a 30-million-gallon-a-day plant there was a political problem before it was an engineering problem. The answer was to make the plant disappear. The Chaparral Water Treatment Plant, dedicated on January 9, 2007, put its treatment works and a buried finished-water reservoir on a fraction of the site, sank what it could below grade, and surrounded the rest with architectural screening, walking paths, restrooms and — a detail that tells you how seriously the city took neighborhood goodwill — a dog park.
The garden was the second half of that bargain, and it went to Ten Eyck Landscape Architects, the Phoenix firm whose founder, Christine Ten Eyck, had spent a career arguing that desert landscapes should look like the desert and behave like it too. Her team treated the plant’s blank 320-foot facade as a canvas, threaded gabion terraces across the site to catch and slow rain, raised red shade sails over gathering spots, and set that oversized steel water vessel at the entrance with its warning about frogs and ponds. When the garden opened in 2008 over the buried reservoir, it held more than 7,000 plants across about 200 species — not a botanical collection so much as a working argument, planted.
What makes it unusual among demonstration gardens is that it is genuinely beautiful rather than merely instructive. Photographers shoot it. Garden writers make pilgrimages to it. It has been certified by the National Wildlife Federation as a wildlife habitat, and on a spring morning the bird count in the mesquites rivals anything on the wash. The plants that were supposed to look austere have matured into something lush by desert standards, which is precisely the lesson: xeriscape is not gravel and three agaves. It is a different palette, not a smaller one.
Why it matters
Scottsdale’s water story is usually told in infrastructure — canals, campuses, reclaimed lines, a treatment plant hidden in a park. This is the one place where the city makes the argument directly to you, for free, in plants you can buy at a nursery six miles away. A hundred acres of green lawn sit a few hundred feet east, and both landscapes are honest: one is what the Greenbelt bought us, the other is what the next fifty years probably look like. Walk the garden, read the signs, photograph what you like. It is the rare piece of public infrastructure that expects you to take something home and use it.