Los Angeles, CA

Los Angeles occupies zone 10b with a 365-day growing season and virtually no frost risk. The recorded last spring frost date of December 31 and first fall frost date of December 28 reflect the area's subtropical climate; freezing temperatures are rare enough to be unusual rather than planned for. The dominant gardening constraint in Los Angeles is not cold but summer heat and water scarcity. Average highs in July and August exceed 85°F, with peaks often exceeding 100°F. Combined with low humidity and regional drought conditions, this heat creates stress for cool-season crops and drives heavy water demand at precisely the time when restrictions are tightest. Figs, basil, rosemary, eggplant, and heat-tolerant tomato and pepper varieties thrive in Los Angeles. Cool-season crops like lettuce, broccoli, and peas are viable but require shade in summer and are best planted in fall and winter when temperatures drop to hospitable levels. The year-round growing season is a distinct advantage but also a complexity: without a hard winter freeze, pest and disease pressure remains steady. Succession planting becomes the organizing principle of the calendar. Rather than a single spring planting, the approach in Los Angeles is to plant cool-season crops October through March and heat-lovers April through September.

Summer heat regularly defeats tomato crops in Los Angeles. Many varieties stop setting fruit above 90-95°F, and peak temperatures in July and August often exceed this threshold. Heat-tolerant varieties perform better, but even these benefit from afternoon shade cloth to prevent fruit scald. Water restrictions conflict with the irrigation demands of vegetable gardening. Most ornamental landscapes are established and suffer from over-watering, but a productive vegetable garden requires consistent moisture. Drip irrigation with mulch is essential to conserve water while maintaining soil moisture. Year-round warm temperatures mean spider mites, whiteflies, and scale insects never enter dormancy. A hot, dry spring can trigger rapid spider mite population explosions by May. Regular monitoring and early intervention (strong spray, insecticidal soap, or predatory mites) is more effective than reactively treating infestations that have already spread.

Plant heat-sensitive crops like lettuce, spinach, peas, and broccoli from October through February. By March, daytime highs exceed 75°F, and bolting accelerates. Heat-lovers like tomatoes, peppers, eggplant, and basil become the priority from April onward. Mark these transitions on a calendar; this succession logic replaces the spring-frost-date planning used in colder zones. Install drip irrigation on a timer and mulch heavily around all vegetables. This combination reduces water use by 40-60% versus overhead watering while maintaining consistent soil moisture to prevent blossom-end rot in tomatoes and fruit cracking in peppers. The investment recovers quickly in reduced water bills. Use 30-50% shade cloth from June through August over heat-sensitive crops like tomato and lettuce. The cloth filters sunlight while allowing air circulation. Remove it by September as temperatures drop and light becomes limiting. Monitor plants for pale leaves or weak growth and adjust shade levels accordingly.