Arizona Landscaping Guide: Thriving Gardens in Desert, Mountain, and Plateau Climates

Arizona packs extreme gardening challenges: short growing seasons, high elevations, subzero to triple-digit temperatures, and scant rainfall. But practical, beautiful ideas can conquer these difficulties. Here's guidance for making the most of your Arizona landscape.

Western Climate Zones

USDA Hardiness Zones are standard, but many Arizona gardeners supplement with Sunset climate zones from The New Sunset Western Garden Book, says Peter Warren, University of Arizona Cooperative Extension. Arizona's 14 biomes generally fall into three zones, each with unique challenges.

Arizona's Northern Edge

Flagstaff to the northern border (including Grand Canyon) is alpine/mountain/intermountain. Short growing season (3–4 months), below-zero winters, moderate summers. Only 20–25 in. annual moisture. "It's a tough growing environment," Warren says. Plants take longer to establish. Microclimates matter—walled courtyards protect sensitive plants. Native plants have deep or shallow roots to grab scarce moisture. Non-natives may not handle extremes.

Arizona's Middle Section

Plateau/highlands with longer growing season (up to 225 frost-free days) and wider Sunset zones (1A–10). Still cold, less precipitation (10–20 in.), hot summers. Native/adapted plants: Arizona cypress, deciduous fruits (apples), junipers, some lilacs. Plant tender perennials/annuals after May 1 (killing frosts possible into April). Xeriscaping—creative landscaping for water/energy efficiency and low maintenance—offers far more than rocks and cactus. "Many flowering plants survive well, native and non-native," Warren notes.

Arizona's Southern Section

Phoenix area: desert climate, Sunset zones 10–13. Low deserts: 7–8 in. annual rain; western low desert even less. Winter cold winds dry everything out. Cacti/succulents are natural, but even natives suffer extreme cold. "Gardening here is about different plant selection and an open mind," Warren says. Good fall/winter rains bring spectacular spring wildflowers.

A fifth season: summer monsoon (July–August) brings daily thunderstorms from the Gulf of Mexico—humidity, heavy rain, flash floods. "It's when we get most of our rain, decreasing plant stress," Warren says.

Find landscape ideas for the Southwest. Check out the Desert Botanical Garden for inspiration.