Hey, I've got a client that has approx. 4k sq.ft. of woods with pine trees. They are looking to have all the buckthorn that is growing in there removed(its all buckthorn) and pine needles put down(I don't need/want commentary about pine needles) I was originally thinking that I could just put brush blades on the echo whips and we could go to town. But then it was pointed out to me that if you do not pull it out, it will grow back. I have no desire to pull out 4k sq.ft. of buckthorn, nor do I think my client is willing to foot the bill for that. Is there some sort of spray that I could put down after I cut it all down that would prevent it from growing back? Or do you guys have another method?