Today I am working in an area that was once heavily infested with Peruvian primrose willow. I have heard numerous people say you can't remove it with just herbicide...I beg to differ! Timing and being TENACIOUS are two things essential to eradicate this invasive with just herbicide (no mowing or fire). Now to get rid of the Brazilian pepper trying to take over the battlefield where that hard fought battle was won! Keep in mind we are trying to win the war against invasives and an occasional battle will be lost along the way. But tenacity can will see me through.