Hi, I dashed off that note to Dell and see I meant to write ground not group when writing about Oxalis purpurea. I don't know if all forms of this would naturalize (read get out of control) in all Mediterranean climates as I understood from my friend Lily from the Mendocino Botanical Gardens that the deer preferred a particularly pretty form there while leaving alone another one so the one she really liked did not increase, but this white one has increased rapidly in my garden. I thought I had put it where I didn't care if it expanded, but then I decided I wanted some other plants in that area too and was sorry. It is however very pretty and long blooming as long as it is in a sunny spot, but I will probably always be restraining it so wished I had kept it in a pot. I had dug out some that came with my garden in a shady spot that expanded well in those conditions, but did not bloom. Not all South African Oxalis species naturalize however. Some you plant out and never see again, but the same species can be quite wonderful in a container. I suppose I should have put a warning next to the Oxalis offerings about the addiction possibilities. Mary Sue