Weeds in South Australia
I came across a great web site whilst looking for possible garden uses for horehound. Not that we get much of it now. When we first moved here the horehound had tree trunks! After years of pulling the plants out and occasional spraying with glyphosate it is under control. A friend informed me that the seed had at least 22 years viability, and that after sitting on an iron roof roasting in summer temperatures! I nearly gave up at that point. Knowing how sort after it is as a medicinal herb, I did have thoughts of actually cultivating it for sale, except that it is a noxious weed here!
Anyway, back to the website. It is an identification site for weeds in Australia. One of my phobias is to find myself actually cultivating weed grasses and it has happened. This site gives a listing of weeds state by state with photos. Most useful. The weeds are divided into categories, eg herbs, grasses, vines etc.