SD doesn’t get a real winter, but we do have a spring. Warm-season lawns start pushing new growth in mid-February; cool-season grasses wake up mid-March. The work you do in this 6-week window sets the tone for the whole growing season.

Skip the timing and you spend June-July playing catch-up on weeds and weak growth you could have avoided for $40 of pre-emergent in February.

The 8-item spring checklist

1. Pre-emergent weed control, by late February

This is the single most important task. Pre-emergent stops weed seeds from germinating before they sprout. Timing is tight:

  • Summer-weed pre-emergent (crabgrass, spurge, goosegrass), apply mid-February. Miss by 3-4 weeks and most of the benefit is lost.
  • Products: Prodiamine (Barricade), Pendimethalin, or Dithiopyr
  • Rate: follow the label for your grass type, over-application can thin existing turf
  • Reapply: usually a single app holds through July on SD lawns

If your lawn has chronic crabgrass or spurge, do NOT skip this step. Post-emergent control of crabgrass in June costs 4-5x what pre-emergent in February would have.

2. First fertilizer pass, early-to-mid March

Warm-season grasses start pulling nutrients aggressively once the soil hits 65°F, which usually happens in SD by mid-March. A balanced starter fertilizer at this point wakes up the lawn evenly.

  • Rate: 1 lb of actual nitrogen per 1,000 sq ft
  • Type: slow-release granular (e.g., 21-0-0 or 16-4-8) for even 4-6 week feed
  • Wait to fertilize cool-season fescue until late March when it’s actively growing

Pair with a liquid iron foliar feed (2-3 oz per gallon, sprayed on the blade) for fast green-up. Iron is especially important on SD alkaline soils where it gets locked up.

3. Mowing height reset, early March

Winter mowing heights for warm-season grasses run 1.5-2”. Spring transition, raise to the middle of the range (2-2.5”). The taller cut encourages deeper root growth going into summer and shades the soil as it warms.

If the lawn got shaggy over winter, do a two-pass reset: cut to 2.5” first, mow again in a week at 2”. Cutting long grass in a single pass removes more than one-third of the blade and stresses the plant.

4. Irrigation system audit, mid-March

Before you turn the controller up for summer, walk the system:

  • Run each zone for its full scheduled time and watch for broken heads, leaking valves, or dry spots
  • Check head alignment, string trimmers and lawn mowers rotate heads off-angle over winter
  • Verify controller settings against current water district restrictions (they usually change in April)
  • Replace nozzle inserts in pop-up heads that have thrown bad patterns all winter
  • Smart controller? Let it auto-adjust to ET data, most modern controllers add more water in April automatically

If it’s been 3+ years since an irrigation audit, or you moved into the house with the existing system, a pro audit ($95-$150) catches more leaks than you’ll find walking zones one at a time.

5. Hedge and shrub hard pruning, March

Hedges get their heaviest prune of the year in late February through March:

  • Boxwood, privet, Italian cypress, hard shape-up to target size. They recover fast in the April flush.
  • Roses, major prune if you haven’t already (January-February is the standard window, but late can still work)
  • Ornamental shrubs, selective thinning for shape and airflow
  • Ficus hedges, selective interior thinning, not shearing, our sun burns sheared ficus brown inside
  • Avoid: any hedge that’s actively flowering (wait until after bloom)

6. Bed cleanup and mulch refresh, March

Beds take a winter beating from leaves, rain-soil, and weed germination. Spring cleanup:

  • Pull existing weeds to bare soil
  • Refresh mulch to 3-inch depth, top up what’s broken down
  • Edge the beds with a steel edger for clean lines against lawn
  • Check drip emitters while you’re in there, clogged emitters show themselves now when plants start pushing new growth

3-inch bark mulch cuts water use 20-30% in the bed zones through summer. Worth doing.

7. Dormant-damage cleanup, March

Inspect the yard for winter damage:

  • Dead branches from Santa Ana wind events
  • Bark damage from gopher or rabbit feeding
  • Cracked pots or hardscape from rare freeze nights (mountain communities especially)
  • Dead spots in the lawn, identify cause (shade, drainage, pet damage) before blindly reseeding

If a dead spot is more than 12” across and showing bare soil, plan a sod patch or overseed, depending on grass type, while temperatures are cool enough for root establishment.

8. Plant new material, now through April

March-April is the best planting window in SD for everything except the coldest microclimates. Soil is warm enough for root development but heat stress hasn’t kicked in yet.

  • Native plants, ceanothus, salvia, manzanita, toyon, establish fastest planted now
  • Succulents and agaves, plant any time, but spring installs get a full season of growth before summer stress
  • Citrus and fruit trees, spring is the ideal window
  • Annual color, snapdragons, pansies (cool), petunias and marigolds (warming up)

Skip any warm-season sod install until at least late March inland; coastal zones can start mid-March.

Why this timing matters

SD’s growing season is long, roughly 9 months of active growth for warm-season grasses. Miss the February-March window and you spend the rest of the year playing catch-up:

  • No pre-emergent → crabgrass takes over in June
  • No spring feed → lawn limps through its biggest growth period
  • No mowing height reset → root system stays shallow
  • No irrigation audit → first hot week has you watering broken zones

A half-day of focused spring prep saves 6 months of corrective work.

Frequently asked questions

What should San Diego spring lawn prep include?

The core items are clearing winter debris, checking and adjusting the irrigation system before demand rises, applying pre-emergent for summer weeds, and setting mowing height for the growing season. Mid-February is the pre-emergent window for crabgrass, spurge and goosegrass, so spring prep that starts in April has already missed it.

Why does spring timing matter so much here?

Because San Diego’s growing season starts earlier than national calendars assume, and several spring tasks are windows rather than chores. Pre-emergent only works before germination. Irrigation adjustments made after the first heat wave arrive too late for the lawn that was already stressed. Getting ahead of the season is most of the value.

When do warm-season grasses green up in San Diego?

Once soil temperatures hold above about 65 degrees, which typically happens from late April into May depending on how close you are to the coast. Feeding or aerating before that point works against the lawn, because the grass is not yet growing enough to use the input or recover from the stress.

Book a spring cleanup

If all of this sounds like a lot (it is), a professional spring and seasonal cleanup handles the entire checklist in one visit. Typical suburban yard runs $600-$850, includes hard hedge pruning, bed refresh, mulch top-off, pre-emergent application, irrigation audit, and first fertilizer pass. From there, weekly lawn maintenance keeps the growing season on track.

Call (760) 400-6355 and we’ll match you with a local pro. Spring cleanup slots book fastest in late February, call by mid-January for the best scheduling window.

We serve Encinitas, San Marcos, Poway, El Cajon, Chula Vista, and all of San Diego County.