Well... I have a purple passion sitting behind me on the window sill. They are strange ones - shrubby in growth with those pretty dark purple fuzzy leaves and they will eventually produce yellow, dandelion-looking flowers (although they don't open up as flat as a dandelion). If you leave the stinky flowers on, they eventually turn into something that looks exactly like those white dandelion puffballs, and the balls will eventually fall apart to release the seeds. I guess if it was planted outside, it would scatter the seeds on the wind like a dandelion. Then all the leaves on the stems will dry up and fall off...lol. But if you just keep watering and feeding, new leaves will sprout from the now woody stems (some from the roots) and they go through the whole growth-flower-puffball-puffball explode-die-regrow cycle again. Mine is sitting in a very very bright north window that maybe gets less than a half hour of sun during the day. Been sitting there for oh... about 5 years now.

I had no idea that the passions produced flowers!! Are they really that stinky?

You are asking how to care for oxalis triangularis? Well, here at my house the way to get this plant to multiply is to vigorously mow, pluck and dig it out of the lawn. A week or so later you'll have 3 or 4 more. (Sorry, couldn't help myself).

I also recently purchased a purple passion have it in hanging in a pot on the patio, or shall I say had!! Yes, the flowers do stink, like old feet dare I say!!! PU-- moved it off the patio into the backyard for fear of company coming over!!! tee hee great foilage plant though!!

If you check the old posts in the Houseplant Forum you should find out even more!