Answer: Most plants will grow in zone 10. The references are for cold weather hardiness. Obviously, in your mild winter climate you won't have to worry about protecting your plants from excessive cold. However.... some plants, such as lilacs and apple trees require a pronounced winter chill before they'll bloom so they won't perform well in your garden. My suggestion is to consult Sunset Western Garden Book after selecting your woody plants and herbaceous ornamentals. The book will explain whether the plant you've chosen requires a pronounced winter chill. If you're planting only annuals and perennials (includes flowers and veggies), they should perform quite well for you. Good luck with your garden!
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