What to Plant in June in Zone 10

The dead season starts here, earlier than most gardens expect

Zone 10 reaches zero workable plantings this month, a full month ahead of where zone 9 just north of it hits the same point. That earlier shutdown is the clearest evidence that heat, not cold, runs this climate's calendar, and treating June as a planting month here almost always ends in seed that never germinates in soil already past 90 degrees at the surface by midmorning.

Push a soil thermometer 2 inches down by midmorning; if the reading is already too hot to hold a bare finger against for a slow count of five, direct seeding anything this month is a waste of seed, regardless of what the air temperature shows at the same moment.

Anything still producing from an earlier planting deserves daily attention rather than a planting mindset; check squash and cucumber vines each morning for fruit ready to pick, since produce left on the vine even one extra day in June heat can go from perfect to overripe and bitter noticeably faster than it would in milder weather.

Irrigation upkeep replaces planting as the main job

This is the month to walk the whole irrigation system end to end, checking drip emitters for clogs and soaker hoses for splits, since a single failed emitter in June heat can cost a plant its whole root system within 2 to 3 days rather than the week or more it might survive the same failure in a cooler month.

Watering timing matters as much as volume now; run irrigation in the early morning hours rather than evening, since water applied at night in zone 10's warm, still air tends to sit on leaves long enough to invite fungal disease, while a morning watering dries off well before evening humidity rises.