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GSP Control

How do you control GSP that is on rock that you cant just peel it off of? I thought I got it off of this one rock and had it in a island but I was wrong. It popped up in a small spot and has spread quite a bit. I wasn't worried at first but now its getting close to some rastas and my digi's. How can I beat it back without harming anything around it?
 
Burns it back but never killed mine. Cover with a rock to shade out, or just keep nipping with the hemostats ill it's gone.
 
I would pull the rock if it wasn't at the bottom of the stack with a piece of pvc running through the middle of it. I'll give the Kalk and snipping a try. Hopefully it melts back, or atleast stops growing and the digi over grows it.
 
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