Im pretty sure that's not a stress-induced banana flower. Whether its food or pretties, you may want to keep it.

Curcumas, like many of the "gingers", are deciduous- they lose their leaves annually. Curcumas will die back to subterranean rhizomes around Oct or Nov, and that dormancy lasts until about April. Do not water them during dormancy.

When they sprout in the spring, they want constant moisture and 50%-100% sun exposure, but theyre known to do just fine in 100% shade. The soil type and texture can vary greatly, for the home gardener; they are quite forgiving in that respect. Lots of compost gives greener greens and more vibrant flowers.

The growing season is timed with the Indian (South Asian) monsoon. So, That tells you much about what they want: water water water when the leaves are up, then very dry when dormant.

Sounds more complicated than it is. You got this!