How many tree species do you have in your yard?

[Curmudgeoness]

5. I have a small city lot, and not just small,

it is triangle shaped----looks like a piece of pie. There is an empty field beside me and they were never willing to sell it to me so I could have a decent amount of land.

But even with that, I have several trees, along the property line. I have three huge (100 plus years old) pin oaks. There is also an ash, and I am concerned that it may have a problem with emerald ash borers. And there is a Norway Maple. With all these trees being mature, it is hard to plant any other trees since it is all so shaded. I do have a Sassafras tree that sprung up and is about 20 feet tall already.

The only trees I would be able to plant are shorter, understory trees, and I have been considering Witch Hazel and/or Serviceberry. But it is a tough yard to get plants to grow!