thats no joke - go bottle hunting in the late fall or early spring and you will find things you wouldnt even have a chance of finding in the summer....that or go buy like 40 industrial sizes of weed b gone and a machete[] actually though i use my machete every day it is a valuable tool for the outdoors...
Can you get a herbicide called "Brushoff" in the US ? it kills almost everything exept grass (won't kill nettles though) while being very safe for stock/wildlife, I use heaps of it every year as you can just spray a paddock and the weeds die as the grass takes off growing [] . I've been thinking about giving a few willow trees in a place I know a squirt with it [] .