I have a few Brazilian Peppers on my property. I cut down a couple of them last year down to a stump. I am now getting sprouts from the stump and all the roots that are close to the dirt top. I have tried stump killer, but I think it loves it because it doesn't want to die. Is this an alien plant life or what? I haven't ground the stumps down since I want to cut down a few other trees on my property before I go rent the Stump Grinder. Any suggestions on how to kill the tree stump and its roots?