Nasturtium

The leaves have a beauty of their own. Reminiscent of water lily pads, the more common ones are flat and round, with the stem attached to the center and the vein radiating out from there. Most varieties have deep green leaves, but there are now a number of nasturtiums that are variegated, almost speckled.
Nasturtiums are a gardener's dream. They are virtually carefree once established. Snails don't seem to be interested in them. They will even self seed and come back the next year in mild climate