Stop and sit, and see what season's poetry is when the late frost leaves in Fenglin are red in February.

There are two explanations for frost leaves, one is the leaves beaten by frost in nature, and the other is the leaves after the first frost and solar terms. This poem is about the latter. Because of its own structural characteristics, maple trees stop producing chlorophyll after autumn, but red pigments such as anthocyanins are still produced, so they will gradually turn red after autumn, especially when the temperature drops suddenly, chlorophyll is quickly destroyed and a large number of red pigments remain. Therefore, maple leaf red is particularly beautiful. In most parts of China, after the first first frost solar term, the temperature plummeted, which will quickly form the beauty of big red leaves. So red leaves are also called frost leaves. To be precise, the season in the poem should be in late autumn or early winter. Because the solar term of the first frost is autumn and winter 15 days. After winter, the red leaves will gradually wither, and naturally there is no beauty of maple leaves. I don't know why your head teacher said it was winter, but late autumn must be the best answer.