Generally, it will take two weeks to see the effects of the treatment, and the effect lasts three to six months. Over time, you may require fewer treatments because weaker muscles atrophy and require fewer injections.
The hibiscus is a heavy feeder that prefers frequent but light fertilizing. A nitrogen fertilizer in the spring and a high potassium fertilizer in the summer work well for the hibiscus plant. Also, fertilizing at the beginning and during the growing season gives the hibiscus needed nutrients for growth.
Soil and Site. Whether you grow hibiscus in the ground or in a pot, the plant needs well-drained but moist soil. Plant outdoor hibiscus in soil high in organic matter and amend the site with a 2-inch layer of compost before planting to help improve it. Soil with a pH near 6.8 provides for the best growth.