A Myth or A Fact

Ive seen a lot of  oak trees and Pine trees, i used to adore them. But i saw most of the time, there are no plants underneath the oak and pine trees, cedar trees as well. Its been so long that soil acidity is the assured problem of it. The top of an inch of the soil might be acidic. But knowing the limestone can help when we put it above the rock the soil will become alkaline on the side. It would take centuries for cedar leaflets, pine needles and oak leaves build a significant amount that can strike alkaline soil.