Each fall there is roughly the same amount of yellow foliage, since in most woody plants Mother Nature sees fit to cache yellow pigments beneath the overpowering verdancy of chlorophyll.
While yellow is a stable commodity in the forest, red is a different story. Trees go through considerable effort to create the assortment of red pigments known to nerds as anthocyanins, so it’s not like red is just hanging around, having a beer with yellow as they wait for chlorophyll to fade. It’s a bit more complicated, which makes it less unreliable. [Read more…] about Seeing Red During Fall Leaf Change