Tropaeolum polyphyllum
I've been growing Tropaeolum polyphyllum for 3 years in a two-gallon pot sitting on sand in a frame. It sends out two sprays of flowers reliably every year -- lovely. This year it is sending up new sprouts throughout the sand bed. Will these new stems make new tubers? It would be nice to have a few more plants so I could experiment with planting some out in the garden.