I recently purchased a 5 gal silver maple that is between 4-5 ft tall, and a red maple that is between 5-6 ft tall. I planted them in my front yard in NC. My question is how fast will they grow and start to provide shade , and when do I and what do I feed them other than water?? They look real healthy and pretty already, the red is fuller and thicker in the trunk , does this mean it is a faster growing tree? I don't want to lose them or feed them wrong. thank you for your help.