Where are the more yellow orange or red leaves – in the upper part of the crown or lower, in the outer or inner?

First you need to figure out why there is a change in the color of the leaves. It occurs in the fall before the onset of frost. This is due to the fact that chloroplasts in cells, due to poor environmental conditions, turn into chromoplasts. They can be either yellow or red. In darker places – at the bottom of the tree, closer to the trunk, the color change will occur faster. It will be slower in sunny locations. Also, toxins are removed into the leaves of the plant. This is the second reason for leaf fall in autumn.