Landscaping Services in San Diego, CA

Landscaping in San Diego

San Diego imports most of its water, sits in a Mediterranean climate that is dry for half the year, and has a very large area designated as high fire hazard. Those three facts determine what a good San Diego landscape looks like.

Water Rules and Rebates

MWELO

California's Model Water Efficient Landscape Ordinance governs new and substantially renovated landscapes. It establishes a water budget for the site, limits high-water-use plants, and sets requirements for irrigation efficiency, soil preparation and mulch depth.

Thresholds depend on project size and on whether a permit is required. The working rule: if your project needs a permit, MWELO documentation is part of it and your designer should produce it as a matter of course.

Turf Rebates

The San Diego County Water Authority, its member agencies and the Metropolitan Water District have run turf replacement rebates for many years. Amounts change; the procedural rules do not:

• Apply and be approved before removing anything. Pre-inspection is usually required and removing the lawn first disqualifies the project. This mistake is made constantly.
• Replacement standards apply. Bare gravel typically does not qualify. Programmes normally require minimum living plant coverage at maturity, and many prohibit artificial turf.

Irrigation

Converting from spray to drip is the highest-value water change available. Spray loses a large fraction to evaporation and overspray; drip delivers to the root zone.

Add a weather-based controller that adjusts to actual evapotranspiration rather than running a fixed clock, and you have eliminated most of the waste in a typical San Diego yard. Many agencies offer rebates on these controllers.

Defensible Space

Much of San Diego County — the canyons, the inland valleys, the backcountry — is designated Very High Fire Hazard Severity Zone, where defensible space is a legal requirement and an insurance one.

The zoned framework:

• Zone 0, the first 5 feet from the structure. The most important and the most neglected. Nothing combustible: no bark mulch, no shrubs against the wall, no firewood on the deck, no vegetation under the eaves. Hardscape, gravel, or bare soil.
• Zone 1, 5 to 30 feet. Well-irrigated, well-spaced plantings. Dead material removed. No continuous fuel path to the house.
• Zone 2, 30 to 100 feet. Thinned, with horizontal spacing between plant groups and vertical spacing so fire cannot climb from ground fuel into tree canopies.

Insurers in San Diego County inspect for this, and non-compliance is a real and increasing cause of non-renewal. Getting rewritten afterwards is difficult. A landscape designer working in a fire zone should raise Zone 0 without being asked.

Note that "fire-resistant plants" are a secondary consideration. Spacing, irrigation and removal of dead material matter more than species selection.

A Palette That Works

San Diego's Mediterranean climate — wet winters, dry summers — suits a specific range of plants, and it is broader than people assume.

California natives — Ceanothus, Manzanita, Toyon, Lemonade Berry, Coast Live Oak, Cleveland Sage, Deergrass, Monkeyflower, California Fuchsia.

Mediterranean analogues — Rosemary, Lavender, Westringia, Rockrose, Olive, Germander, Teucrium.

Succulents for structure — Agave, Aloe, Dudleya, Senecio, Euphorbia.

Coastal-tolerant — Coast Rosemary, Sea Lavender, Coprosma, Carex pansa as a lawn alternative.

The most common failure with California natives is summer irrigation. Many are actively killed by regular summer water, which promotes root rot in warm soil. Establish over the first winter, then taper hard. A native garden on the same irrigation schedule as a lawn will die.

Soil and Drainage

San Diego soils vary considerably — decomposed granite inland, heavier clay in some valleys, sandy near the coast, and compacted fill on graded lots throughout.

• Test drainage before planting. Fill a hole with water and see how long it takes to drain.
• Plant high on mounds or berms where drainage is poor. Mediterranean and native plants are highly intolerant of wet feet in warm soil.
• Do not over-amend. Rich organic backfill in a poorly draining hole creates a sump. Most of this palette wants lean soil.
• Mulch generously — three inches of coarse organic mulch moderates soil temperature and reduces evaporation. Note the exception in Zone 0, where mulch must be non-combustible.

Costs in San Diego

Timing

• Plant in autumn. October through December is the ideal window: soil is still warm, air is cooling, and winter rain establishes the plant over its first season without summer stress.
• Spring planting works but requires supplemental irrigation through the first summer.
• Avoid summer planting unless you are committed to nursing the plant through.
• Prune natives in late summer or early autumn, when they are dormant, not in the growing season.

Tips for San Diego Homeowners

1. Apply for the rebate before touching the lawn. This sequencing error costs people thousands.
2. Clear Zone 0 first if you are in a fire hazard zone. It is free and it matters most.
3. Water natives in winter, not summer. Summer irrigation kills more of them than drought does.
4. Convert spray to drip before spending anything on plants.
5. Plant in autumn and let the winter rains do the establishment work.