I too would like to add my two cents about one of my most favorite genera. The genus is huge, about 500 species, and about 1/3 of it grows as bulbous forms in South Africa. The rest are from South America. Of the ones in South America, a number of them make bulbs, and the rest do not make bulbs as all. Many grow as succulent scrambling stems and some have woody stems. The non-bulbous ones tend to be in more desiccating environment or in higher altitudes. If anyone is worried about growing Oxalis that spread by bulbs, try growing some of the rhizomatous ones like O. articulata/floribunda group. These are most easy to obtain. Oxalis squamata makes a wonderful display but I have a hard time propagating it by cutting. Oxalis (maritima) tortuosa has interesting leaf form. The woody/semi-woody stemmed ones that are most easy to find are O. sanmiguelii (wrongly named in the trade as herrerae) and O. peduncularis. The succulent stemmed ones are hard to find the in the trade, except for Oxalis tuberosa (oca). These are all summer growers. The picky ones tend to be the tropical ones that you would need a greenhouse to grow. But they are wonderful plants if you have the space. Here are a few photos: Oxalis sanmiguelii http://flickr.com/photos/xerantheum/… http://flickr.com/photos/xerantheum/… Oxalis peduncularis http://flickr.com/photos/xerantheum/… Oxalis articulata/floribunda group http://flickr.com/photos/xerantheum/… http://flickr.com/photos/xerantheum/… Oxalis tortuosa with large carrot-like tuber(?) http://flickr.com/photos/xerantheum/… Oxalis squamata http://flickr.com/photos/xerantheum/… http://flickr.com/photos/xerantheum/… Oxalis hedysaroides 'Rubra' or 'Fern Fire' = greenhouse http://flickr.com/photos/xerantheum/… http://flickr.com/photos/xerantheum/… http://flickr.com/photos/xerantheum/… Oxalis aff. dispar = greenhouse http://flickr.com/photos/xerantheum/… http://flickr.com/photos/xerantheum/… Oxalis gigantea = winter growing from Chile but it's wonderful! http://flickr.com/photos/xerantheum/… http://pacificbulbsociety.org/pbswiki/index.php/… Nhu On Thu, Feb 7, 2013 at 12:12 AM, Michael Mace <michaelcmace@gmail.com>wrote: > Fair enough, but since there are many people on the list who don't > necessarily have much experience with Oxalis, I'd like to add my two cents: > I think the genus is far too diverse to make a blanket statement about its > invasiveness. There are probably hundreds of Oxalis species. Some are > notorious weeds. Some are so picky that they're almost impossible to grow > in captivity. Most are somewhere in between. >