Ten sturdy ground cover plants that can take a lot of punishment. The creeping carpet verbena (Phyla nodiflora) tolerates both heat and moisture and is very hard-wearing.
The blue bobhead (Isotoma fluviatilis) not only blooms for months until autumn, the densely growing perennial can also be walked on. You shouldn't jump around wildly on the Spanish stonecrop (Sedum hispanicum), but you can walk on the typical green roof without any problems.