Plant, Bromeliad 6"
In general, bromeliads need a fairly specific set of conditions to bloom—and these conditions vary from genus to genus, and even from species to species in a single genus. Their bloom cycle is affected by day length, temperature, humidity, water, and feeding. You will need to research specific genera and species to determine how best to grow them.
When cultivated as indoor plants, most bromeliads—both epiphytic and terrestrial species—are usually planted in a mixture of potting soil and sand. Watering is done either by moistening the soil or by filling the center depression ("cup") formed by the rosette of leaves.
While it can be difficult to accurately replicate the conditions any particular bromeliad needs to bloom, some research has shown the plants can be forced to bloom by exposure to ethylene gas.1 So if you want to force your plant to spike, place it in a tightly sealed, clear plastic bag for up to 10 days with a ripe apple. The apple will give off ethylene gas as it decomposes. Make sure any water is drained from the bromeliad's central cup before attempting this.