Last year, I received 4 elderberry bushes as a substitute for something else in my tree order. Not knowing anything about them, I planted one in each corner of my 60 x 100 foot garden. This winter, I read that they need to be close together for pollination. I want to move them closer together, but I'm unsure of how to do it. How should they be spaced? I don't know what the variety is, and I have no idea how big they will get. If they are all the same variety, will they still cross pollinate, or do I need to buy another variety? They really grew a lot last year, and I want them to do well. I've heard good things about using elderberry blossems to treat the flu. Should I dry the blossems for tea? Has anyone ever tried it? Thanks for your help, everyone!