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.
Add an insecticidal soap to the hibiscus plant if you notice insects. Insects such as scale, mealy bug, white fly and aphid thrive on these types of plants. Prune the hibiscus in the early spring with pruning shears. Remove dead and diseased wood, branches that rub against each other and droopy foliage.