So I have a few torbay palms (that's what I call them anyway)that were planted by previous house owner. I have tried unsuccessfully to get rid of them by cuttthem down, chopping them out etcetc but they reappear with more side shoots after a while. The winter seems to have worked in my favour this year and a large part of one clump has rotted off. What on earth can I do to stop new ones shooting up? Have I really got to poison it?