Arizona · Gardening & Landscape
Arizona outdoor gardening — a real planning guide for the Sonoran desert.
Most gardening advice is written for temperate climates and dies here. This guide is written for Phoenix, Peoria, Scottsdale, Mesa, Chandler, Gilbert, and the low desert — Zone 9b, alkaline soil, 115°F summers, and a two-season planting calendar.
The honest version: The single biggest mistake we see in Arizona gardens is planting on the East Coast calendar. Putting tomatoes in the ground in May guarantees failure — the soil hits 100°F by June and roots stop feeding. Planting in September and February gives you two harvests a year instead of a dead summer bed.
01
Zone, sun, and soil
- USDA Zone 9b across most of the Valley (9a outlying, 10a central).
- Sun map your yard for 3 days — full sun south/west, filtered sun east, shade north.
- Native soil pH 8.0–8.5, low organic, caliche layer 12–24" down.
- Amend planting holes: 30–40% compost + gypsum. Never plant edibles in unamended native soil.
02
Two planting seasons
- September–October: lettuce, spinach, kale, broccoli, peas, root crops, cilantro, wildflower seed.
- February–March: tomatoes, peppers, squash, cucumbers, basil, corn.
- May–August: no new planting. Maintain existing only.
- Trees and shrubs: October–March for best establishment.
03
Water design
- Drip on a smart controller — Rachio 3 or Hunter Hydrawise.
- Separate zones: trees / shrubs / vegetable beds / turf.
- Established shrubs: deep water every 7–14 days summer, 21–30 days winter.
- Trees: every 10–14 days summer, monthly winter, always deep (24–36").
- Vegetable beds: 1–2" per week summer via drip lines on 6–12" spacing.
04
Bed prep and mulch
- Break through any caliche layer at plant location.
- Amend hole with compost + gypsum for pH and drainage.
- Mulch 3–4" deep — decomposed granite (natives) or shredded bark (edibles).
- Raised beds for vegetables: 12–18" deep, filled with 1/3 native, 1/3 compost, 1/3 aged manure or leaf mold.
05
What AE builds
- Full landscape design with plant selection matched to sun/zone/water.
- Raised vegetable and citrus beds with caliche-broken drainage.
- Smart drip irrigation on Rachio or Hydrawise with owner training.
- Season-appropriate install (October–April for trees and shrubs).
FAQ
Common questions.
Most of the Phoenix metro is USDA Zone 9b (25°F to 30°F winter low), with Zone 9a in higher outlying areas (Cave Creek, Anthem, Queen Creek east) and pockets of Zone 10a in central low-desert areas. Practically, this means most citrus and Mediterranean plants overwinter unprotected, and summer heat (not cold) is the limiting factor for most vegetable and ornamental choices.
Two main planting seasons: (1) September–October for cool-season vegetables (lettuce, spinach, kale, broccoli, peas, root crops, cilantro, dill) and wildflower seed, (2) February–March for warm-season crops (tomatoes, peppers, squash, cucumbers, basil, corn). Skip May–August planting for anything new — root establishment cannot keep up with heat load. Existing established plants are fine year-round.
Rule of thumb: established shrubs get deep water (12–18" penetration) every 7–14 days April–October, every 21–30 days November–March. Trees: every 10–14 days summer, monthly winter, always deep. Vegetable beds: 1–2" per week summer via drip. Turf and annual flowers pull much more. The efficient design is drip irrigation on a smart controller (Rachio or Hydrawise) with separate zones for trees, shrubs, and beds — never mixed with turf.
Native Sonoran soil is high pH (8.0–8.5), low organic matter, and often has a caliche (calcium carbonate) layer 12–24" down. Bed prep: (1) break through any caliche layer at plant location, (2) amend the planting hole with 30–40% compost + gypsum for pH adjustment, (3) mulch 3–4" deep with decomposed granite or shredded bark to reduce evaporation and moderate soil temperature. Never plant in unamended native soil for vegetables — for natives and cactus, amend lightly or not at all.
Reliable ornamentals: red bird of paradise, Texas sage, lantana (not with tortoises), yellow bells, desert marigold, penstemon, brittlebush. Edibles: citrus, pomegranate, fig, artichoke, Swiss chard, kale, arugula, rosemary, oregano, thyme. Trees: palo verde, mesquite, desert willow, ironwood for natives; Chinese pistache, Chinese elm, live oak for shade. Full plant list with photos and care at /arizona-plant-tree-guide.
Ready to plan an Arizona garden that actually thrives?
AE builds landscape and edible-garden scope with irrigation design, bed prep, and plant selection matched to your yard's sun, soil, and water.
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Related landscape reading
Homeowner FAQ
More gardening questions?
Bed prep, irrigation zones, and seasonal planting timing — in the Landscape section of the Homeowner FAQ.