Fall Colors and Callused Trees
This plant is growing against the west wall of our garage. The ground around the plant is mulched and there is a large vine growing right next to and a little over this plant. Fall colors develop as a result of the break down of chlorophyll and the subsequent expression of Carotenoids and Anthocyanins that produce the various reds, yellows, and other colors. Leaves stop producing chlorophyll as a result of changes in temperature and daylight. It is likely that the side of the plant facing the building is receiving more warmth during the day as sunlight is reflected off of the wall. This has caused the leaves on this side of the plant to continue producing chlorophyll which overpower the other pigments and produce the green coloration of most plants.
This callused tree is an apple growing in the back yard. Like many apple trees it is likely that the scion was grafted onto the root stock many years ago. The long, deep scar located at the base of the tree is the tell-tale sign of a grafting callus.
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