Southern California Coastal & Inland Valleys
Pinch out new blossoms and growing tips of melons, winter squashes, and determinate tomatoes to force growth into the fruits that have already set. Any that set from now on won't ripen sufficiently before cool weather comes, unless you want lots of immature green tomatoes around Thanksgiving. Indeterminate cherry tomatoes, on the other hand, can be allowed to continue setting, as the little fruits ripen more quickly.
Feed citrus for the last time this year, and water trees less as the weather cools and the rains (hopefully) take over. Cupped, wilted, or falling leaves signal moisture stress from hot winds, which can occur even when the soil is damp. Provide lath, shade cloth, or other semi-open material for protection. Pale green new citrus leaves may need a dose of liquid chelated iron or a solution of fish emulsion and kelp.
Remove Fruit Mummies
Remove and destroy fruit mummies on the ground or still on the tree to reduce the chance of brown rot next year when winter rains bounce the spores back onto the bare tree branches.
Strawberries with whitish or yellowish leaves need to be fertilized one last time with a high-nitrogen food. After that, fertilize them with a low-nitrogen, high-phosphorus, and high-potassium fertilizer to help them harden off for winter.
Prune and Feed Roses One Last Time
This is the last month to prune roses and feed them for their last bloom cycle before going dormant. Hold off on severe pruning until plants are fully dormant in January. Feed plants lightly, and water. Continue to water them only in the mornings to lessen mildew and other disease problems.