Why do asters, dahlias and chrysanthemums bloom in autumn, and tulips and peonies in spring?

Asters, dahlias and chrysanthemums are short-day plants and require shortening of daylight for flowering, which happens after summer – in spring. And tulips and peonies, on the contrary, are long-day, they need lengthening of daylight hours, which occurs after winter – in spring.

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