In summer, with the increase of light, the photosynthesis of leaves is enhanced. Because chlorophyll is absolutely dominant, the leaves gradually turn green, and the effect is not as good as that in spring. In autumn, the new leaves can remain red, but they are already dark, and the old leaves have turned dark green.
Autumn comes, the temperature drops, chlorophyll synthesis is blocked, and the red pigment containing anthocyanins makes the leaves appear red.
Most varieties of Hongfeng are red in the new leaf stage, gradually turn green in summer, and then turn red after frost. In order to make the red maple turn red before and after the National Day, we can use the method of picking leaves to promote red, forcing new leaves to sprout. The specific method is to remove all the leaves and petioles from the plants in mid-August. Put it in a sunny place, follow the manure 1-2 times, water it 1 time every day, keep the basin soil moist, and spray water on the branches appropriately. After about half a month, axillary buds will sprout one after another and open into small red leaves. In late September, the whole leaves are ripe and the whole tree is red, just in time for the National Day flower viewing.