Edible Purslane
Purslane is another edible weed that most people in the US think of only as a weed that is hard to eradicate. Personally I think it is a nice ground cover but perhaps my tastes are biased by the fact that I know the plant is useful and edible. Purslane has more omega 3 fatty acid (great for my bad back) than any other plant source that has been tested. That's some pretty powerful benefits.