Spring lawn prep in San Diego: the February-March checklist

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.

Book a spring cleanup

If all of this sounds like a lot (it is), a professional spring 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.

Call (858) 808-6055 for a free quote. 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.