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Hyacinth Plant

Q.plant hardiness zones

Zone 92346 zone 9 | susan perry added on March 3, 2017 | Answered

I live in zone 9 in southern California. Why does the hardiness map only cover cold temperatures and not hot? It gets up to 110 F here and a lot of plants designed for full sun just don’t survive the summer. Are there flowers other than cactus and succulents that would work?

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