How to ID a Norway maple
We have several maple trees in our yard. We built this house and planted the trees over 30 years ago. One I know is a Norway as I seem to remember it being called a Crimson King at the time. It has those maroon/black leaves that I am no longer fond of but the other two I am not sure about. I thought they were a Silver maple and a sugar maple, but one is so dense that we have trouble growing grass under it and it drops thousands of seedlings every year into my beds which I have to pull out. How can I tell the difference between these two and a Norway maple? Thank you very much.