Light and Temperature
Some of the new cultivars are grown very successfully in light shade. Potted hibiscus enjoy some protection from our intense, summer sun. A pool/shade screen, providing 25% shade, offers blessed relieve during the hottest part of the summer day and helps prevent stressing the plants, especially those planted in black, plastic pots. Lighter colored pots help prevent the roots from overheating.
Many growers recommend a good layer of compost once a year. If that cannot be done, meet your plants' needs with good soil porosity and an adequate fertilizer formula.
Hibiscus can normally withstand a light freeze. But if the weather is windy, temperatures as high as 45 degrees can still produce damage. How much cold a plant can tolerate depends on exposure, wind strength, length of cold, available moisture and slight differences in cultivar tolerances.Hibiscus need real daylight to bloom. During the winter months, they enjoy full sun all day and will bloom beautifully as long as the temperatures remain mild. A slow down in bloom production and a decrease in blossom size will be noticeable once the evening temperatures drop regularly below 55 degrees Fahrenheit.