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.
Cut back plants after a frost to the ground and compost the flower stalks. Companion Planting and Design. Plant hardy hibiscus in back of a perennial flower border or among other perennials that have finished flowering such as peonies, iris, and coneflowers.pace plants 2 to 3 feet apart in the garden. Growing Tips. Hardy hibiscus like moist soils, so keep plants well watered and mulched with bark mulch to prevent weeds from crowding them and maintain the soil moisture. Fertilize in spring with a layer of compost.