Dear Andrew, Dear Lauw, When I read Andrew's notes about O. articulata I immediately thought he is writing about a different species than me and the explanation came with Lauw's note. I am not a botanist and do rely on the names given to my by the supplier but I think that O. crassipes is the plant I meant. It also makes sense as its rhizomes are 'thick feet' as the species name tells. For flowering time it DOES flower with me all summer interrupted only by lack of fertilizer or very bad treatment, I like to use it as ground cover on the surface of very large tubs and it flowers right through winter in the greenhouse if it is barely bright enough and warm enough. Is it perhaps stopped flowering by higher summer temperatures than I have here in our average German summer? I truly cannot imagine this plant being a weed as it has no bulbs or bulbili, the rhizomes may break off and root somewhere else but this will be a slowish process. But one never knows as plants do behave differently in different ecosystems. Regards, Uli