The hibiscus plant is a large genus of plants that range from tropical to warm climate types. The plants are available as annuals, perennials and hardy perennials in both shrub and tree varieties. Hibiscus plants produce large, trumpet-shaped flowers in white, red, pink, orange, purple and yellow. Tropical varieties must be wintered indoors or in a greenhouse, while hardy perennial varieties can winter outdoors with protection.
Fertilize the hibiscus plant in September with a 2-10-10 fertilizer to harden the plant for winter conditions.
Move potted hibiscus plants to a shady location in a southern or western exposure once the evening weather begins to cool at night in early fall. This will get the plant ready for indoor conditions.
Inspect potted plants for insect infestation while they are still outdoors. Spray infected plants with an insecticide to eliminate pests.
Bring potted hibiscus plants indoors once the temperature drops below 40 degrees Fahrenheit consistently.
Place the hibiscus pot in a tray filled with stones and water. This will increase the humidity level around the plant during the drier winter months. Do not submerge the pot in water.
Cut back perennial hardy hibiscus growing outdoors to the base of the plant once the temperatures drop in fall to a high of 40 degrees Fahrenheit.
Apply a generous layer of mulch on top of and around the outdoor growing plant. This will hold moisture in the ground and insulate the plant during the winter.