I found this large Opuntia growing on the edge of someone's yard in southern Virginia about 2 years ago. It was right next to the sidewalk and there was a broken pad on the ground, so I picked it up and took it home. I've been growing the plant in a pot since I got it, but I'm wondering if it's possibly a cold hardy species which I could plant outside here in zone 6. I can't be sure, but I believe the parent plant may have had yellow flowers. I imagine this must be a somewhat common species, but I'm just hoping for a proper ID.
The only photo I have of the parent is on the Google street view: http://goo.gl/maps/sxyPU
The pads are about 6 inches across. It's not very clear in the street view, but the new growth has long spines on it, while the old pads seem to have lost most of them (at least on my plant that's how it is). I can take a picture of my plant later, if it will help.