M. Frary
Bonsai Godzilla
Drive over some. Set some on fire....If you have a year or two, I would get in there and hack some of them down to a foot or so; trample a few; bend some over and weigh them down with a rock; machete off one whole side; cut the roots to about 1 foot circumference.... in short give them hell. See what happens by the time they need to go.
CW