To enlarge the flowers, open up the sheath that encloses the flower bloom with your thumb and gently lift the blooms. Make sure the soil is moist and keep the leaves misted with water. They should not, however, be kept in a room that is always dark.
Red ginger is a wonderful houseplant.
The blooms should be misted every other day to replicate the natural environment in which the plants grow. Leave the bloom submerged overnight and it will last at least a week, perhaps two. Take an assortment of small tropical plants and place them in the bowl with a good potting soil and some aquarium rocks. By watering it once a week and misting every other day, you can create your own little miniature rain forest.