This is a map of New York State's geography from "Kelvinsong," the free media illustrations of Wikipedia.
The interesting aspect of this is it's source of information, "New York State Education Department in Albany." (click here) This page is a very interesting page of information.
The purpose of placing this map in the discussion of a young forest is the clear illustration of different geographical areas of the state. Trees sometimes grow dependent on elevation. I am sure many have heard the words, "...that is the tree line..." or "...just below or just above the tree line...." There is a limit to establishing a forest due to elevation which also reflects a change in soil type. The steeper the hillside or mountain the less likely there will be soil with any kind of depth, hence, limiting the species of trees, scrubs and sometimes the herbaceous layer.
The absence of vegetation is most notable along a glacier field. It is an extreme in climate and very rocky and the only real vegetation at that elevation are lichens (click here).
When enjoying a walk through a young forest, appreciate also the elevation in which it grows. When planning to protect a young forest, there should be no frustration if there is a place of elevation that does not host a young forest. That absence of growth will produce a unique ecosystem within the forest system.
The map to the right is from another interesting e-page which discusses forests in New York State. (click here)
Many states that value their forests have "tree nurseries." New York State does have one. (click here) New York State Tree Nursery will sell native tree seedlings to consumers. They are probably a very healthy supply of trees.
Consider buying New York-grown seedlings produced from local seed sources - it's an investment for your property that will pay off in healthier, stronger trees and shrubs for our future.