Q. How to grow an avocado plant in Maryland?
If your avocado has roots, just pot it up and put on a warm, sunny windowsill. Even if it doesn't bear fruit indoors, you can use the leaves for flavoring dishes that call for avocado.
I uploaded a PDF from the book
Don't Throw It, Grow It! by Deborah Peterson. It's here in our library if you'd like to borrow it. The file attachment gives tips for growing avocados indoors.
Hope this helps