There is a local gardening show on the radio every Saturday morning in Columbus Ohio. The host is always suggesting that you root feed your trees and small shrubs. I never thought too much about it until I bought this root feeder. Wow! Root feeding does make a difference. My only advice is to make sure you shop around for the feeder refills. I found the best price for those is on Amazon. If you go to the big-box stores you will pay a lot more for the same product.