Reblooming
One of the primary reasons our customers are not able to get their orchids to bloom a second time is a lack of cooler air in the evenings. To encourage reblooming, place your orchid on a windowsill for a good temperature differential between day and night. While this temperature difference is great for the plants when initiating blooms, once the buds form and the plant is ready to bloom, you should move it away from the window as temperature differentials can cause already formed buds to drop.
After your Phalaenopsis orchid finishes blooming, cut the stem back to the third node from the base of the stalk. A new flower spike should emerge in a few months. The moss and bark materials that orchids grow in break down over time, so you should repot your orchid every 2 to 3 years in the spring, or in the fall after it finishes blooming. You will know your orchid needs repotting when the medium breaks down and begins to look like dirt, or when the roots start growing significantly out of their pot.