flowerbug
Garden Master
i don't want any more poison spraying going on around me than already happens, so i'd say that without being able to use manual methods that repeated scraping with some plowlike device might do it enough. it takes a few years to get them knocked back. but once they're gone and if you can keep after the small ones that will sprout eventually you can remove them.
here we lost a lot of them to disease. and deer... and ...
here we lost a lot of them to disease. and deer... and ...