Oxalis
Last time I was home (at my mom's), I was coverting her oxalis. She divided and gave me two - one burgundy and one burgundy w/green. I was thrilled!
I brought them home, sat them at the kitchen window. They proceeded to died. I moved them to a different location. They are now in G's office window sill, which he barely tolerates. But LOOKIE! after 3+ months, I have TWO leaves .... (crossing fingers)