Why Spring Is Critical for Arizona Landscapes
Spring in the West Valley is not just a time when things start growing — it is the narrow window when smart landscaping decisions set the tone for the entire year. Between March and early May, Litchfield Park, Goodyear, Buckeye, Avondale, and Tolleson experience a brief stretch of moderate temperatures that is ideal for planting, pruning, and system maintenance.
By mid-May, daytime highs regularly exceed 100 degrees, and the planting window slams shut. Any new plants installed after that point face extreme heat stress before their roots have established, dramatically reducing survival rates. Similarly, irrigation problems that go undetected in spring become expensive disasters during the brutal June heat.
This checklist covers every task a West Valley homeowner should address between March 1 and April 30 to ensure their landscape is prepared for the long, hot summer ahead.
March–April Task List
Work through these tasks in roughly chronological order as March transitions into April:
Early March:
- Apply spring pre-emergent — This is your last chance to block summer weeds like spurge, puncturevine, and crabgrass before soil temperatures trigger germination. If you have not applied by mid-March, you are likely too late. See our complete pre-emergent timing guide.
- Prune frost damage — If January or February freezes damaged bougainvillea, lantana, red bird of paradise, or other frost-sensitive plants, wait until you see new green growth emerging before pruning away dead wood. Cutting too early can trigger new growth that a late frost kills.
- Cut back ornamental grasses — Trim deer grass, purple fountain grass, and other ornamental grasses to six to eight inches above the ground. New growth will fill in within weeks.
Mid to late March:
- Inspect and test your irrigation system — Run each zone and walk the property looking for broken emitters, clogged drip heads, leaking valves, and dry spots. Repair any issues before the heat arrives. Our seasonal irrigation guide covers spring settings in detail.
- Increase watering frequency — Transition from winter schedules to spring schedules. Most desert plants need watering every seven to fourteen days by late March as temperatures climb into the 80s and 90s.
- Fertilize established plants — Apply a slow-release, low-nitrogen fertilizer to established trees, shrubs, and flowering plants. Desert plants do not need heavy feeding, but a light spring application supports bloom production.
April:
- Install new plants — April is the last comfortable month for planting in the West Valley. Desert-adapted species installed now have six to eight weeks of moderate temperatures to establish roots before extreme heat arrives.
- Refresh gravel — If your decorative rock has faded or thinned, spring is the ideal time to add fresh material while temperatures are still comfortable for outdoor work.
- Schedule tree trimming — Professional tree pruning in spring removes dead wood, improves structure, and reduces the risk of branches breaking in monsoon winds.
Pre-Emergent Timing in Spring
The spring pre-emergent application is arguably the single most impactful task on this entire checklist. Here is why timing matters so much:
- Summer annual weeds germinate when soil temperatures at the four-inch depth reach approximately 55 to 60 degrees Fahrenheit.
- In the West Valley, this threshold is typically crossed between late February and mid-March, depending on the specific year's weather pattern.
- Pre-emergent must be in place and watered in before seeds germinate. Once a weed seedling has emerged above the soil surface, pre-emergent herbicide has no effect on it.
The most common spring weeds targeted by pre-emergent in Litchfield Park, Goodyear, and Buckeye include:
- Spurge — Flat, mat-forming weed that spreads rapidly across gravel. Produces a milky sap when broken.
- Puncturevine (goat heads) — Trailing vine that produces painful spiny seed pods. A single plant can produce thousands of seeds.
- Crabgrass — Aggressive grass weed that invades both gravel and turf areas.
- Russian thistle (tumbleweed) — Fast-growing annual that breaks free in fall and tumbles across yards depositing seeds.
Professional weed control services use commercial-grade products with longer residual protection than retail options, giving your landscape better coverage through the long summer growing season.
Irrigation Startup and Spring Planting
Irrigation startup is more than just turning the system back on after winter. A thorough spring startup includes:
- Running each zone individually while walking the yard to observe every emitter and sprinkler head
- Checking for leaks at connections, valves, and the backflow preventer
- Cleaning or replacing clogged emitter filters and screens
- Flushing drip lines by opening end caps and letting water run for two minutes per line
- Reprogramming the controller with spring watering times — typically 30 to 50 percent more run time than winter settings
- Testing rain sensor or smart controller weather integration
Spring planting tips for West Valley homeowners:
- Plant in the morning or late afternoon to reduce transplant shock. Never plant during midday heat.
- Dig the hole twice as wide as the root ball but no deeper. Desert plants rot if planted too deep.
- Water new plants every two to three days for the first two weeks, then gradually reduce frequency to encourage deep root growth.
- Apply two to three inches of decorative gravel around new plantings, keeping rock a few inches away from the base of the plant.
Need help getting your yard ready for spring? Julio's Landscaping offers complete spring cleanup, weed control, irrigation repair, and planting services throughout the West Valley. Contact us or call 623-879-2290 to schedule your spring service.