We had more rain in 2020 and the foliage was spectacular. My opinion only is the late freeze and the obstructed sun from smoke during growth days. Excessice Precip wouldn't matter although 4 feet of water under the Hickory stump we removed was incredible. It was like hitting a geyser of oil once the stump lifted by the excavator. (Too much fun on the excavator our friend let us use)