As long as your hibiscus is planted in a container, it's an easy matter to bring it indoors, even if you live in Canada or the Northern United States. Provide your hibiscus with plenty of bright light, and its tropical beauty can be enjoyed all year long. If you prefer, move the plant outoors during the warm weather months, as long as you bring the hibiscus indoors in autumn before the nighttime temperatures fall below 40 degrees F.
Water the indoor hibiscus sparingly, and don't water until the soil is bone dry. Make sure any water is absorbed within 30 minutes.
Put the hibiscus where it will be in bright sunlight for 6 to 8 hours each day. If you live in a dark climate, supplement available light with grow lights, and put the light as close to the hibiscus as possible.
Give the hibiscus a warm water shower once a week, using a strong spray on the undersides and tops of the leaves. This will discourage spider mites, which are a common pest for indoor hibiscus.
Keep the temperatures in the room between 60 and 70 degrees F. Keep the hibiscus away from cold drafts. Don't put the hibiscus too near a window, which can be too hot during the day, and can draw cold air at night.
Feed hibiscus a water-soluble fertilizer every week between March and October. Don't fertilize the hibiscus between October and March.
Prune hibiscus between August and October. The plant will do best if it's limited to three or four main branches, which are pruned by 1/3 of their length once yearly. Remove any weak growth, or shoots that grow sideways instead of upright.
Repot the hibiscus in spring if you notice roots growing through the drainage hole in the bottom of the pot. Remove the plant from the pot and use a pair of scissors to cut off any soft or dark brown roots. Healthy hibiscus roots will be plump and light in color. Move the hibiscus into a container one size larger, filled with commercial potting soil.