My wife had been trying to find oxalis for some time. Finally one of our good gardening friends mentioned that she had quite a lot of it growing in her back yard between the cracks of her patio. So we went to get some and planted it in our back yard among the clover we already had growing there.
It's really amazing how many places it has spread to in such a short time. We have since found it growing some twenty feet away near the back fence and in a hanging pot. If I ever figure that one out I'll let you know.
It's a wonderful contrast to the clover though as the color pops among the green.