My mother had a silver foliaged convolvulus she found in Greece. It doesnt fit any that I know: has pale permanently pink flowers, is not a bush but a low…
It will need staking and may become invasive.
Propagate by seed sown outdoors in mid spring for hardy plants or under glass in spring for tender plants, perennials and sub-shrubs by softwood cuttings in late spring or summer. The annuals should be sown direct and you will need to soak your seeds for 24 hours prior to sowing them.