Pineapple plant

I decided to treat my daughter to some fresh pineapple this week. I don't know much about picking pineapples so I just chose the one with the nicest looking top. (What else?) She said it tasted fine. And of course I planted the top.

But lo and behold while I was outside doing that I chanced to look at the one I had planted earlier this year. The one that had died from neglect while I was recovering from my surgery. Well what do you know? A new shoot has come up like a Phoenix rising from the ashes! What a surprise that was. Now if I the cold that's coming just doesn't kill them. Maybe I should bring them inside...

Any suggestions on how hardy these are?