I have an area that is right next to my house and there is already purple oxalis growing there. Currently it is dormant. I really like this ground cover as it flowers throughout the spring and summer. The ground here though has all sorts of little debris and generally looks lousy since we moved in. Can I take a large bag of garden soil/potting soil and overlay the oxalis to sharpen up the bed area?

Or mulch? Some of the oxalis tubers are near the surface in big clumps and others are still buried perhaps 2-4 inches below. Can I break up the large bundles I see near the surface (this will create more plants, right?) -- and would laying soil or mulch over the tubers already a few inches into the ground cause them to be buried too deeply?

Thanks for any help! : )