If you have a brushcutter/strimmer use the the metal wheel with the four blades, don't forget the goggles, and it zips through the stems, then you need a wife to drag it away and put it on the bonfire. If you use the secateur method try cutting the top and bottom off plastic empty litre water bottles then slip your hands through them that stops the b*****s attacking your arms. I don't personally like Roundup although it is not as viscious as some chemicals.