Human pollution may cause a lot of stress for these trees as well. And yes, trees can get stressed! Many things harm the ginkgo trees and if unsupervised, these trees could always die out. Even nearby grasses may steal enough nutrients from the soil that the ginkgo trees can go hungry. It's always best practice to treat the ginkgo trees with care regardless of how strong they may be. It's hard to know how tough each day it is to survive as a ginkgo tree.
