Oxalis also known as Shamrock is a wonderful plant for shade gardening. It is very low maintenance and doesn't require a lot of watering. You can neglect it for a week and it will still put on a show. I love the pink flowers over dark purple leaves. This is a tough plant and it doesn't stop blooming. Just make sure it's in the shade. This is a keeper, I just hope it will survive the zone 6 winter, or maybe bring it indoors during winter.
The leaves of this plant close up at night and it opens up at dawn:
This window box is coming along nicely after about three weeks of regular watering, fertilizing, and deadheading.
This is how it looked like at the beginning of June:
Original recipe is here.