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.
If you have very sandy soil either grow your hibiscus in pots, or be prepared to water often and use timed-release fertilizers on the surface of the soil. You can also try amending the sandy soil with good compost and other organic ingredients so that it will hold more water and fertilizer.efore you plant your hibiscus, you will need to dig a very large hole that you fill with a high quality planting mix, allowing plenty of extra room for the hibiscus to grow roots into. Super Sandy Soil: If your soil is very sandy, you will probably have problems growing hibiscus in it.