My favorite international grocery store has a bed full of these. I collected a couple seed pods no one was going to miss, planted them in the fall by the street where it gets no water or fert. Then two different utilities companies tore up the ground twice in winter. Just one plant came up.
Seed packet had only around 10 seeds but the butterflies seemed to like the few plants that came up so will save seeds. The idea was to plant something smallish but tallish near tricky to pollinate plants so bugs can find tiny flowers. (Achocha, miracle berry, etc.)