Contorted filbert trees
Will 90 degree heat damage the leaves on a contorted filbert tree and turn them yellow? What can be done about this? I don\'t have a photo.
Certified GKH Gardening Expert
Heat won't directly cause the leaves to yellow, but during heat like that, the tree could be experiencing water stress, which could cause the leaves to yellow.
I would recommend increasing the water to the plant. This article will also help: