That particular rhizome has been there just one year. I had one bloom in my vegetable garden after one year as well. It was out in the full sun, but didn't seem to thrive as well so I moved them to the semi shaded area. We have brutal summer sun here in central Florida and from what I've read the ginger should do great, but is seems to do better on the edge of the woods. This one bloomed during this last blast of summer - we've had mid to upper 80's this past week. Now this morning is 58 degrees and it has given up LOL
I'm going to let this one overwinter in this spot and see what it does. Last year I brought some in for replanting in the spring and that worked well, too! It's all experimentation for me so far lol.
Thanks for stopping by and I hope you have a great weekend!