Can fall flowers grow after hot summers?

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Yes, there are a lot of fall-bearing perennials, such as Russian Sage, Sedum and Chrysanthemums, that flourish when the heat of summer is gone. They also like milder climates and since they are hardy they can adapt to the cooler and drier weather in the fall. Perennial varieties that are either drought-tolerant or heat-tolerant are more successful when chosen.