Unlike the fungi, every single macroscopic, native/naturalised plant or alga (most seaweeds are algae, not plants) in the UK has a common name, and quite a lot is known about nearly all of them. If they are useful for something then the chances are our ancestors knew about it, even if some of that knowledge has since been lost. Still, as things stand, far more is known about the wild plants than is known about the wild fungi. There is also a far greater number of people in the UK who have this knowledge – not just foragers but gardeners and ramblers and all sorts of other people who consider the countryside their own natural habitat.
The topic of edible and useful plants can only be given the briefest of introductions here. Hover over the plants/algae tab to access a drop-down menu.
Photo shows three of the best edible wild species, growing by a river in Sussex: marsh samphire, sea lavender and sea purslane.