Flowerin Ginger plants need very humid condition for their healthy growth & for flowering. They need moisture near their roots all the time. However, they can not tolerate water stagnation. They thrive best in semi shade.
Nandan Kalbag

Aloha Nandan,
I've been able to grow 2 types or species or varieties (I don't know exactly which) of Hedychium to blooming. However, I have 4 others which have not yet bloomed. I'm sucessful in getting the plants through Winter in the N. American growing zone of 5. Yet these 4 plants have not bloomed. They get the same amount moisture and fertilization as the 2 types that do bloom. Does it depend on the type of hedychium? I would be grateful for any information as these plants come from home in Hawai'i and are sort of my children in a way.
Aloha,
Kahoa

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It depends on what kind you have. Giant Red Shell, they bloom once they reach a height of roughly 10 feet (unless they suffer a freeze).

The butterfly groups will all bloom within 4 months with the minimum temperature of 70 or higher. The butterfly gingers also require more watering if they are in full sun. The White Butterfly is actually aquatic.

I have grown (I forget which one it is) the ginger from the grocery store, it's in the Hedychium family, it makes peach flowers and smells fantastic. I just set it in a pot of mixed soil and let it start to grow (I actually planted another one and it rotted).

As far as fertilizer goes, I've used so many different kinds. Time release water activated ferts like Osmocote X14 are fantastic. Miracle Gro is another good one, especially for container plants in general.

I thought it was in the Hedychium family. It's Zingiber officinale:

http://www.floridata.com/ref/Z/zing_off.cfm