Getting orchids to bloom again requires close attention to watering and humidity levels, fertilizer, the amount of light the plant gets and the temperature at night. In some cases, it may be necessary to repot the orchid in order to get it to bloom again.
There are several different kinds of orchids on the market, but the steps to get them to bloom again are essentially the same. One of the most common orchids is the phalaenopsis, or moth orchid. Caring for this type of orchid is quite similar to caring for others. The first step is to ensure that the plant is regularly watered, enough so that the roots do not dry out completely in between waterings. In homes with dry air, the humidity can be increased for the plant by setting it on a tray of pebbles without letting the plant sit in water.
Be sure to provide the plant with enough fertilizer, which may be full-strength once per month or quarter-strength on a weekly basis. Most orchids thrive in bright light rather than direct sun, making it important to place the plant in windows that face towards the east or west when possible. At night, the plant does best when the temperature drops between 10 to 15 degrees Fahrenheit.
Orchids are quite sensitive to salt build-up, which often comes from fertilizers and traditional tap water. For this reason, it may help to repot the plant right after it finishes blooming.