I got a potted green, white-flowered Oxalis as a gift 13-15 yrs ago. I've kept it in FULL shade (no direct sun)in Lake Charles, LA (8b?) Orange Park , FL (9a) and now in the Woodlands TX (9a) It gets really nasty looking when the old culms/corms/whatever they are die off and then gets gorgeous and blooms when the new whatevers shoot out. When it got ugly about 8-9 yrs. ago, I repotted it in a bigger, nicer pot and it wasn't happy about that. I put it back in the old 10 inch plastic pot and it's still there and having just gone through a die-off phase will be sprouting and blooming like crazy soon. It likes to be soaked/constantly wet. I fertilize maybe every yr. or 2 when I think about it.(Osmicote) No pests. No soil changes. No babying. I LOVE it!
Pat

Yes, I have it in 2 places where it never sees sun and it has done wonderfully. It disappears when it gets really hot, but comes back as soon as the temps cool back down.