When you care for a hibiscus, you should remember that hibiscus flowers best in temperatures between 60-90 F. (16-32 C.) and cannot tolerate temps below 32 F. (0 C.). In the summer, your hibiscus plant can go outside, but once the weather starts to get near freezing, it’s time for you to bring your hibiscus indoors.
When hibiscus are in their blooming stage, they require large amounts of water. Your hibiscus will need daily watering in warm weather. But once the weather cools, your hibiscus needs far less water, and too much water can kill it. In the winter, water your hibiscus only when the soil is dry to the touch.
A growing hibiscus plant needs lots of nutrients in order to bloom well. In the summer, use a high potassium fertilizer. You can either use a diluted liquid fertilizer one a week, a slow release fertilizer once a month, or you can add a high potassium compost to the soil. In the winter, you don’t need to fertilize at all.
These are the basics for how to care for hibiscus plants in your garden. As you can see, they are a easy maintenance, high impact flower that will make a garden in any part of the world look like a tropical paradise.