Sedum is a closely matting groundcover that holds the moisture in the garden without taking anything from the garden.
We use the dried leaves (careful not to use too much) to spice up bland food. Sedum can cause irritation to some people so test it carefully first.
Sedum also works well, as do many of the succulents, as a wound healer, laxative and emetic.
Very quick spreading groundcover, ver tolerant of most soil types even poor, exhaused soil.