"Archimedes Plutonium" wrote in message
...
This year I am getting brilliant red and crimson from my amur maples. A
few years ago I was gruntled in seeing them very much yellow.

I am suspecting the hypothesis of water during the time they turn color
is the factor as to whether they are yellow or red.

Anyone have evidence that it is the amount of water present that causes
red instead of yellow? This year was a wet year.

Liquid Amber responds to a wet, well nourished year by producing insipid
fall colours.
I suspect, as for Liquid Amber, water/nutrient stress plays a part in the
colours you are experiencing.
Annie in British Columbia