Los Angeles, CA

Los Angeles gardening in zone 10b is defined by the absence of frost risk and the dominance of summer heat and drought. With a last spring frost date of December 31 and first fall frost date of December 28, the growing season is effectively 365 days. This shifts the typical gardening challenges: instead of protecting against cold, the focus is heat management, water conservation, and selecting varieties that thrive during hot, dry months.

The zone's winter lows of 35-40°F are mild enough for tender perennials like figs, rosemary, and basil to overwinter outdoors. Heat-loving crops like tomatoes, peppers, eggplant, and sweet potato flourish year-round with proper attention to water. However, the same heat that enables year-round production also creates stress during summer (July-September) when irrigation demands peak and rainfall is minimal.

LA's gardening calendar is inverted from much of the country: fall and winter are the peak vegetable seasons because cooler temperatures prevent bolting and reduce pest pressure. Spring planting can begin almost any time, but summer plantings need more attention to irrigation and shade management. Mediterranean herbs thrive here with minimal care once established.

The dominant constraint is water. Successful gardeners in Los Angeles either embrace drought-tolerant plants or commit to consistent irrigation during warm months.

LA gardeners face three recurring problems. First: summer heat stress. Tomatoes, peppers, and eggplant grow vigorously in spring and early summer, but sustained heat during July-September often causes blossom-end rot (calcium deficiency triggered by inconsistent watering), flower drop, and sunscald on fruit. Second: water scarcity and irrigation costs. Most landscape plants are adapted to dry conditions, but productive vegetable gardens demand regular water. Third: year-round pests. The absence of killing frosts means aphids, spider mites, whiteflies, and scale insects never truly disappear. They're dormant in winter but resurge by March. Insecticidal soap and horticultural oil work here, but require more frequent application than in colder zones.

Succession-plant tomatoes and peppers in two waves rather than all at once. Plant the first crop in February for spring-early summer harvest (April-June); plant a second crop in July for fall-winter production (September-December). Summer planting avoids peak heat stress and allows fall tomatoes to mature in cooler weather, improving flavor and reducing splitting.

Mulch heavily and water consistently to prevent blossom-end rot. Three to four inches of wood chips or compost stabilize soil moisture and moderate soil temperature. Drip irrigation on a timer is more efficient than hand-watering and prevents the erratic watering patterns that trigger calcium deficiency.

Build a shade structure for summer weeks. Even heat-lovers need relief during July-August. A 30-50% shade cloth over pepper, eggplant, and tender herb plantings keeps them productive through the hottest months.