I got a beautiful wine grape that was brought from Romania and looks like it should be in old master paintings. It tastes good too but there was a green seedless grape that got planted with it ( the person who gave it to me thought they were both the burgundy-purple wine grape) The green grape is more aggressive and was out growing the purple grape. I cut it to a short stub. Is there any way to get rid of the green grape without harming the purple one? Will constantly removing the new foliage do it?