Alpinia pumila is one I find to be a slow grower. Well I would actually call it a slow spreader. I have grown it for about 3 years now in my yard, the most successful spots have been in filtered light under the canopy of another plant, or in shade. In direct sun the silver coloration will not be nearly as prominent. It has slowly spread from the original plants, but by no means fast. Give it some time, it should resprout. I have some divisions in pots that were very slow to get going at first, but eventually they sprouted.

Sincerely,
Scott Durand

Thanks so much for your response, it was very informative. I will be patient! :D