I bought three Truffula Pinks in the annuals section last spring that did really well for me here. I think it's actually a tender perennial so I'm hoping I can keep them over winter. Any tips? Does it need to go dormant? Or could I just keep it inside like a houseplant?

The database indicates it is a perennial, so that puts it in the realm of worth trying to me. From there, you just have to decide if you have a spot and want to mess with it. Just don't wait until it's exposed to near-freezing temps. That can freak out topicals. If the lowest hardiness is Z11 as indicated in the DB, it's probably not equipped to go dormant. Few Z11+ plants do that.

If you try, let us know what happens! : )

Globe Amaranth (Gomphrena pulchella Truffula™ Pink)