Southwest Gardeners' October Checklist: Zone-Specific Planting & Maintenance

The autumnal equinox brings softer light and milder temperatures to the desert Southwest, divided into three zones:

• Low zone (USDA 9–10): Phoenix, Palm Springs, Laughlin, Yuma — hottest, no winter.
• Middle zone (USDA 8–9b): Tucson, warm Las Vegas areas, China Lake, Presidio — hot with little winter.
• High zone (USDA 6b–8): El Paso, Albuquerque, Payson, St. George — moderately hot with short, definite winters.

Fall Planting by Zone

Mild temperatures and warm soils allow optimal root growth in October. In middle and high zones, delay planting heat-loving/tender perennials (Lantana, broad-leaved evergreens like evergreen oak and India hawthorn) until spring — they won’t establish before cold weather, risking foliage damage. Low zone gardeners can plant most species since roots develop before cold snaps.

Turfgrass

Too late for warm-season lawns (Zoysia, Bermudagrass) in all zones. Exception: cool-season turf in oasis areas of middle/high zones can be sodded with proper soil prep and irrigation.

Region-Specific Planting Lists

• Low zone: Any native/adapted plants — low desert wildflowers, herbs, cool-season vegetables, Ironwood (Olneya tesota), Desert Lavender (Hyptis emoryi), parsley.
• Middle zone: Cold-hardy palms (fan palm, Washingtonia spp.), plus natives/adapted: wildflowers, herbs, cool-season vegetables, Mexican grass tree (Dasylirion quadrangulatum).
• High zone: Cold-hardy native agaves, yuccas, succulents; most woody natives/adapted; woody herbs; high-desert wildflowers. In desert grasslands/foothills, plants germinate with moisture by spring. Examples: soaptree (Yucca elata), turpentine bush (Ericameria laricifolia), Penstemon spp.

Simple Cleanup

Enjoy autumn; leave heavy work for later. Remove small deadwood from trees/shrubs (pruning live growth now stimulates tender new growth vulnerable to cold). Rake debris, leaves, and litter from beds and lawn — an ordered space is more relaxing.

Water Management

Adjust irrigation timers as temperatures drop, especially in low/middle zones. Reduce watering. For barren areas, create water-harvesting features (basins, swales, berms) away from structures to support lush plantings. Consider stormwater capture for future irrigation — especially valuable in upland areas far from municipal water. Avoid overwatering late in the season to prevent excessive tender growth.

Protect Plants from Rabbits & Javelina

Rabbits seek cool, moist plants in dry seasons, devouring even prickly pear cacti. Only ocotillo and rosemary are truly rabbit-proof. Use chicken-wire cages (3–4 stakes beyond foliage) on new plants; remove as plants grow. Javelina (wild pigs) also damage plants — consult University of Arizona’s “Javelina Resistant Plants” and Arizona Game & Fish’s “Living With Javelina.”

Plan for Year-Round Balance

Don’t rely solely on seasonal color. Mix evergreen and deciduous foliage for winter structure. In high zones, mass native cacti/shrubs like turpentine bush (Ericameria laricifolia) or creosote bush (Larrea tridentata). In low zones, pair deciduous plants (Mexican evening primrose Oenothera speciosa, ocotillo, desert willow Chilopsis linearis) with evergreens. Always favor species thriving in alkaline soils with minimal water.