so theres this company thats been around here for many many years, and they have a lot of the big locations that they do where they send five mowers to do the jobs an so on. well they do the casino where my mother works, and they now no longer do that because they didnt do the work to the likings of the guy in charge. Another location they do there mulch looks like two foot high volcanos. I was alwasy told you want to put your ring on the outside of the trench and taped towards the trunk of the tree to help water run off run towards thetree. or does it not matter.