I am getting ready to enclose a large area of myrtle (vinca) groundcover for my run. I know that the chickens will undoubtedly destroy it all, but is it possible that it could destroy the chickens too? Should I spray it to try to kill it all before I enclose it? I'd rather not spend my time digging it up; that'd be a BIG job for someone who's laziness personified. Maybe I could get Anne to dig it up if it has to go.