Thoroughly soak them and allow the soil to dry slightly before watering again. Water less when they are not blooming. Gloxinias bloom several months at a time. Fertilize them every two weeks when growing and blooming. After blooming, allow the plant to enter a dormancy period.
Hydrangeas prefer high light, but avoid afternoon sun in the summer.
They tolerate average indoor temperatures and need lots of water while in bloom. They like average to high humidity. Fertilize them every two weeks while they are blooming. They bloom for about a month. Varieties that are used indoors usually are not hardy and are difficult to re-bloom.