Hibiscus plants are tropical and enjoy humid environments. While they do not thrive well with soggy roots or too much water, during the growing and blooming season it is important to provide ample water to support the plants. Winter and dormant periods require less frequent watering. According to the National Gardening Association, these plants need approximately 1 inch of water weekly.
Fill a spray bottle with warm tap water. Lightly mist the leaves and base of indoor hibiscus plants during the early morning hours on a daily basis.
Place a warm mist humidifier in the same room as an indoor hibiscus plant. This will provide continuous humidity without saturating this tropical plant.
Pour warm tap water at the base of an indoor hibiscus plant until the plant's soil is thoroughly saturated. Allow to completely drain. Repeat watering weekly after the soil dries.
Turn a garden hose onto low-pressure water level to water established outdoor hibiscus plants. Place the hose at the base of hibiscus plants. Allow the water to run for three to five minutes. Repeat watering weekly during the growing and blooming season.
Water outdoor hibiscus plants only when the ground is completely dry during the late fall and winter months when the plants have finished growing and blooming for the year and are in their dormant phase.