kinda late to grow some now though...
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I've obtained a giant purple one from my boyfriend... If there is a link with more info on making an overgrown one look decent, it would be appreciated, or this plant may find itself in the compost bin.

I have a big plant of the purple oxalis. It's very beautiful and easy to grow. Mine gets lots of sunlight and water and does fine.

I have a purple shamrock plant and it does look kinda spindly and weird at first. It's kind of a vigorous grower if the conditions are right (as described in the article). I get a few new sprouts everyday, even little flowers--just pinch back what you don't like.

Keep it pinched back and grow in bright light (though not too much direct sun in southern locales) for best results. Oxalis likes light, but not a lot of heat. It even used to grow in our yard in Phoenix, provided it got plenty of water and stayed in the shade during the summertime.

I have white and purple oxalis growing all over my yard. It will probably die back as it gets hotter this spring and summer. I was thinking of digging up some of it to keep in a pot in my windowsill. You guys just provided me with the last little bit of inspiration to do it.