- 1). Grow the hibiscus tree in well-draining, slightly acidic soil with a pH range between 5.5 and 6.5, and partial sunlight exposure. While full sunlight causes leaf scorch, full shade stunts growth and flower development. Enrich the desired planting site with shovelfuls of organic matter such as compost or manure.
- 2). Provide the tree 1 to 2 inches of water every week, to a depth of 12 to 18 inches. Increase the frequency of irrigation during dry weather or drought. Avoid overwatering the soil or causing the plant to develop wet feet. Use a soaker hose to provide a slow and steady stream of water around the base of the tree.
- 3). Feed the tree three to four applications of a 15-5-10 fertilizer every year, preferably in early spring, after flowering, during midsummer and in early winter. Depending on the age of the tree, spread 1/2 oz. of fertilizer for smaller plants, or use 1 lb. of fertilizer per application for a mature tree. Irrigate the soil after the fertilizer application to prevent burn.
- 4). Prune the hibiscus tree in early spring to invigorate its growth. To maintain the desired shape and size of the tree without disrupting blooming, remove one-third of the longest limbs using sharp, sterilized pruning scissors. Cut the next longest limbs one month later, and the remaining long branches 30 days after the second pruning schedule.
- 5). Inspect the foliage and limbs of the tree for pests such as aphids, whiteflies, spider mites, mealybugs and thrips that suck essential juices with their piercing mouthparts. Follow label directions for applying a registered pesticide to treat large infestations. Although chemical control for hibiscus diseases such as canker and leaf spots are available, the best method of control is to prune and destroy infected wood.
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