Southwest Gardeners' April Checklist: Desert Garden Tasks for Spring

The American Southwest spans Arizona, New Mexico, and parts of California, Nevada, Texas, and Utah—covering low deserts, high deserts, and mountainous regions across USDA zones 5 through 9.

Winter's browns have given way to bright green. Leaves appear on trees and shrubs. April is prime time for desert gardeners to add colorful plants and reimagine containers. With warming weather, check irrigation controllers, pull weeds, and prune remaining frost-damaged plants.

Gardeners at upper elevations can sow cool-season vegetable seeds, plant bare-root roses, and thin fruit as it appears.

All Desert Regions

Adjust the Irrigation Schedule

As temperatures rise, so do plant water needs. Watering schedules must change with the season. Depth matters: water trees to 3 feet, shrubs to 2 feet, letting soil dry between waterings.

An easy depth test: push rebar into soil after watering. It slides easily until hitting dry soil. Measure penetration depth and adjust watering duration accordingly.

Shown: The Living Desert in Palm Desert, California

Low, Mid-, and High Deserts

Warm Up Landscape Color for Spring

Plant yellow-flowering plants like angelita daisy (Tetraneuris acaulis), desert marigold (Baileya multiradiata), feathery cassia (Senna artemisoides), and damianita (Chrysactinia mexicana).

Shown: Angelita daisy

Grow Vines as Ground Covers

Vines aren't just for walls and fences—they make great ground covers. Try Carolina jessamine (Gelsemium sempervirens), purple lilac vine (Hardenbergia violaceae), Lady Banks (Rose banksiae), or trumpet vine (Campsis radicans) on the ground.

Shown: Purple lilac vine

Plant Herbs in Containers

Love fresh herbs? Plant favorites like basil, rosemary, sage, and thyme. Apply slow-release fertilizer at planting—all they'll need for the season. Herbs dislike excess water. Test moisture by sticking your finger to the second knuckle; water if dry.

Shown: Basil, purple basil, rosemary, sage, and thyme

Try a Succulent as a Container Plant

Containers aren't just for flowering annuals. Succulents offer low maintenance and great texture with columnar, spiky shapes.

Agave, barrel cacti, and columnar cacti are good container choices. Place against a wall or flanking an entryway for greatest effect.

Well-drained soil is essential—use a succulent-specific mix. Ensure pots have drainage holes. Water every one to two weeks in summer, depending on needs and weather.

Shown: Smaller succulents flank a potted Mexican fence post cactus

Plant Warm-Season Annuals

Rising temperatures mean switching cool-season annuals for heat-lovers.

Celosia, blue salvia (Salvia farinacea 'Victoria Blue'), red salvia (Salvia splendens), moss rose (Portulaca grandiflora), and vinca (Catharanthus roseus) handle desert heat beautifully.

Before planting, amend soil with 2–3 inches of compost and add slow-release fertilizer for summer-long blooms. Liquid fertilizer every other week helps, but avoid leaf contact—it can burn in hot weather.

Shown: Blue salvia

Upper Elevations (Over 6,000 Feet)

Thin Fruit Trees

Once fruit forms, thin by removing excess. Apple, apricot, peach, and plum trees have limited resources. Selective removal channels resources to remaining fruit for larger harvests. Thin to approximately 6 inches between fruit.

Shown: Apricots before thinning

Sow Cool-Season Vegetable Seeds

Time to sow favorites: broccoli, carrots, chard, lettuce, radishes, spinach directly from seed.

Work 2–3 inches of compost into soil before planting. Add blood meal and bonemeal (per package directions) for natural nitrogen and phosphorus.

Too early for tomatoes outside, but start them indoors from seed now.

Shown: Radish seedlings

Plant Bare-Root Roses

Envision a fragrant rose garden? Select grade 1 roses with three large canes when possible. Soak bare-root roses at least 24 hours before planting.

Amend soil with compost—mix 50% compost with 50% native soil.

Don't fertilize newly planted roses; they need time to grow roots. Wait until first flowers blossom before fertilizing.

Get ready for May. Temperatures warm fast. Cacti begin flowering—time to heatproof your garden for summer.

Shown: Medallion hybrid tea rose

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