What did I do wrong? I am so disappointed with it. I sprayed my fields and all that seems to have died are docks and nettles. Thistles still going strong.
However, they were only tiny. Would be best to spray again in another couple of weeks when they're a bit more established?
The thistles took longer than the nettles, which died rapidly. It took up to two weeks for the large thistles to die, but the small ones were dying after 24 hours. Did you use it strong enough? Different plants need different strengths.