The first time I saw the fall colors out in the vineyard, I made an assumption. White grape leaves turn yellow and red grape leaves turn red. I was wrong. But I've never figured out what's right. Does the leaf color have to do with the variety of grape? How does that explain varying color in parcels that are planted with the same variety of grape? Is leaf color based on weather, pollen, or some other factor? Is it totally random?
I must admit that I've done zero research on this vital issue of our time. The whys and wherefores of grape leaf colors continue to elude me. But they're pretty.