The NutriStar Hibiscus fertilizer is a granular fertilizer that is perfect for all flowering tropical plants. This fertilizer can be used on all flowering tropical plants including althea, confederate rose, Ixora, mallow hibiscus, rose of Sharon, TX sage hibiscus, and tropical hibiscus. Our slow-release nitrogen formula allows for feeding only once a month! Our slow-release granules allow for extended feeding and easy application. Feed hanging, potted, and grounded plants. This is the best fertilizer for hibiscus plants that can be used on both indoor and outdoor plants. Adding calcium, iron, and magnesium helps improve cell structure, promote healthy roots and shoots, and aid in chlorophyll generation. Our formula also contains cottonseed meal which contributes to the oxygenation of soil and moisture retention. NutriStar works with the soil and the soil biology to provide your flowering tropicals with the best nutrition at the right time and in the right amount. Plants get an immediate boost upon application, coupled with lasting benefits that continue to feed.