Posted: 10/11/2014 at 15:36
The one with the broad, bright green leaves is the chickweed. The bittercress is the one in the middle with the pods sticking up above the flower. The leaves grow mainly as a basal rosette. Personally I wouldn't bother eating either of them!
How about a Bugle, Ajuga reptans, for ground cover? There are some lovely bronze-purple varieties, and it has spikes of blue flowers in the spring. A few plants would soon spread by runners to cover the area. It doesn't mind being trodden on when not in flower.