Gorgeous large, lush, green leaves w/silver spots. However, only a few flowers in my container garden. I use a natural, organic fish-fertilizer of 5-1-1. I purchased the rhizomes from QVC, which sprouted quickly. Lots of blooms after a couple of months. Now only a couple. I plan on bringing them in for winter to replant next spring.
You may have to much Nitrogen in the soil. This will cause lots of lush greens and few flowers.
You can add Phosphorous with a Bone Meal fertilizer.
Here are a few links for you.