How To Care For Giant Hibiscus. To care for Hibiscus rosa-sinensis grow the tropical hibiscus in full sun and well-draining soil that is always moist. The hibiscus delights with its intensely colored flowers.
I usually use a balanced slow-release organic fertilizer on my entire garden 4-4-4 NPK for example twice per year but my soil is fairly rich. Water the hibiscus regularly during warm weather when the plant is in bloom. The soil in both grow locations should be well-draining to help avoid the risk of root rot.
To ensure that your plants receive the nutrition that they need we recommend feeding them with a water-soluble or slow-release fertilizer.
By correctly planting and caring for your giant Hibiscus plants you are providing the species with what it needs to flourish for decades. Fertilize every two weeks in spring and summer with a high-nitrogen fertilizer. When you care for a hibiscus you should remember that hibiscus flowers best in temperatures between 60-90 F. Water generously nevertheless avoid waterlogging Keep soil moist.