1.   Apply about a tablespoon of hibiscus fertilizer every three to four weeks.

2.   Some gardeners use hibiscus fertilizer, which has a high potash number.

3.   Use a high-potash fertilizer, such as a hibiscus fertilizer, to encourage color.

4.   Use a high-potash fertilizer, such as a hibiscus fertilizer, rather than a high-nitrogen fertilizer.