I think it must be Houttuynia cordata (Giap ca in Vietnamese) in particular the green variety (although the Chameleon Plant also has the "fishy" smell). Quite easy to strike from cuttings from the Asian food stores but often sold as a ground cover in nurseries. Much harder to eradicate from the garden once you get it growing... |
Here is a link that might be useful: Houttuynia cordata