This tuberous Nasturtium species from Chile is quite remarkable and has become a focal feature in our front rock garden until it goes dormant for the year in late July. The blue digitate foliage with up to 7 small leaflets arranged circularly drape and spill until obscured by yellow flowers in June-July. This is adapted to unstable rock slopes deep roots form new tubers. Plant the dormant bulb in well-drained soil deeper than you think, no, deeper than that, still deeper - there you go! A foot or foot and a half gets it done. Propagation is by seed or by tubers with large ones getting cut up like you are planting potatoes.