Speaking of maple leaves, you must think of Canada, a country where even the national flag is maple leaves, known as "the land of maple leaves".

Canada's best time to watch maple leaves is no more than 2 weeks.

Maple leaves in northern Canada have changed color since mid-September, and the peak is about the last week of September-the first week of October.

The best time for maple leaves in southern Canada is about mid-October.

If there are no special circumstances, in early November, Canadian maple leaves have fallen too much to watch, just a rain or a wind.

Maple leaves will fall very fast.

Maple Leaf Avenue is a famous maple appreciation road in Canada.

But it's not just a road, it's 40, 417 and 407 kilometers connecting Toronto, Montreal, Ottawa and Quebec.

Maple Leaf Avenue is 800 kilometers long and runs through canyons, rivers, mountains and lakes along the way. 2.St. Anne Canyon.

St. Anne Canyon is located 40 kilometers east of Quebec City, which is a beautiful waterfall canyon.

There are not only many waterfalls in the canyon, but also dense trees and fun everywhere.

Because of its special geographical location, there are a lot of tourists coming here on holiday, which is the most popular in Quebec.

Located on the east bank of Lake Superior, the Yagawa Canyon ushered in the best season in autumn.

If you have plenty of time, you can board a train in Susan Marie, the famous maple leaf capita.

And drive into a 180-kilometer red maple scroll to explore the beautiful maple posture at the bottom of the canyon.

Why do maple leaves turn red?

From its own point of view, the leaves show red mainly depends on two substances, one is carotene, the orange-red pigment commonly found in chloroplasts.

The other is anthocyanin, which exists in the cell fluid in the vacuole.

When the cell fluid is alkaline, the anthocyanin is blue-purple, and when the cell fluid is acidic, the anthocyanin is red.

After the beginning of autumn, the anthocyanins in the leaves of Codonopsis lanceolata increased, and the drop in temperature made the destruction of chlorophyll disappear.

So the green leaves turned red.

There are also temperature reasons.

When the temperature drops rapidly to a certain extent, and the temperature at night is much lower than that during the day, the leaves have not yet withered, and most of the chlorophyll has been destroyed.

At the same time, the increase in the temperature difference between day and night also contributes to the formation of anthocyanins, so the leaves turn red quickly.

If the temperature drops slowly, and the temperature difference between day and night is small, the chlorophyll has not been destroyed and the tree has withered, it will not become beautiful red leaves.