The Plant

My dad has the greenest thumb in the universe. He’s the type of person that can pick up a pretty leaf and stick it in his hat band and then four days later when he remembers it’s there; he can stick it in dirt and grow a beautiful exotic plant.
That gift skipped me.
All my life, if I so much as helped someone move a potted plant across the patio, it would die.
I’ve been as greenly cursed as he is blessed.
HOWEVER…
When MiniMe was in Girl Scouts, she decorated a tin can and planted seeds in it. Either the seeds were duds, or she inherited my nongreenliness. After a long wait to see what would sprout…oh I’d say two months or so… I happen to see some dinky little plants on sale at Home Depot. There was one “plant” that looked like just a leaf in dirt. It sort of reminded me of the way my dad would “start” a plant, and it was only a dollar.
I bought it and took it home with me, full well knowing it would be dead in a week.
It survived.
It even grew. It’s been knocked over, had leaves broken, been cattacked, and dehydrated the many times that no one has watered it for as much as a month or more at a time.
I finally decided this past summer (after about five years), that it just might live. I took it out of the can and gave it its own place of honor in a genuine flower pot. It seems to have doubled in size since summer.
What I want to know is;
What is it?