I'm about to use the Bayer Granules for the first time. Will it hurt trees if you apply a little too much? Directions say to use 2 teaspoons for a 1 gallon container. How should I judge how much to use on small pots? Most of my trees are in pots smaller than 6". Does anyone have experience in using the granules? I would love any usage suggestions. I don't want to damage my trees. Posts on here seem to have success with using the granules. I just couldn't find any posts with how much people use. Also, does it really last 12 months? I would appreciate any help. Thanks!