When growing Phalaenopsis orchids inside, keep them in a humid room where the temperature is constantly between 65 and 80 F, according to Just Add Ice Orchids. Water the orchids with three ice cubes once a week and place them in a window where they will receive indirect sunlight.
Phalaenopsis orchids are some of the easiest to grow indoors, but they require ideal conditions and care to thrive. With proper care, these orchids' blooms will stay vibrant for weeks and will bloom for months.
To properly care for orchids, avoid wetting the leaves when watering and never assume they must be watered several times per week. Over-watering can cause the roots to rot. During the summer, the plants will need to be watered more often than during the winter months. Watering an orchid using ice cubes will prevent over-watering and will keep the leaves dry.
There are fertilizers specifically designed for orchids and these should be used approximately once a month for a healthy plant. Too much fertilizer results in root burning, which in turn results in fewer flowers, according to Beautiful Orchids. When in doubt, follow the manufacturer's direction on the fertilizer or plant food.
If a Phalaenopsis orchid fails to bloom, be sure it is receiving sufficient light. Placing these plants in a south or east-facing window seems to work best. if this is not possible, try using a supplemental lighting placed 1 to 2 feet above the foliage, for 12 hours per day.