Can anybody help me out with identifying wild-growing brassicas in the UK? It feels pretty hopeless at the moment. Sea kale and wild cabbage are easy. The problems come when I start trying tell the difference between white mustard, black mustard, "field mustard" (rape) and charlock. They all look very similar, and apparently they also hybridise with commercial rape crops.
Is there a way to make this easier?
Does anybody forage for these plants?