- Species and varieties: Hibiscus is a genus of flowering plants in the mallow family, Malvaceae. The deep red hibiscus is often associated with Hibiscus rosa-sinensis, commonly known as the Chinese hibiscus or tropical hibiscus. This variety is known for its large, vibrant red flowers.
- Hybrid or heirloom: The deep red hibiscus can be found in both hybrid and heirloom varieties. Hybrids are often bred for specific traits such as flower size, color intensity, and disease resistance. Heirloom varieties are traditional cultivars that have been passed down through generations without genetic modification.
- Pruning and training: Pruning is essential for maintaining the shape and health of the hibiscus plant. It is best to prune in early spring before new growth begins. Remove any dead or damaged branches and shape the plant as desired. Regular pruning encourages bushier growth and more abundant flowering.
- Fertilization needs: Hibiscus plants are heavy feeders and benefit from regular fertilization. Use a balanced, water-soluble fertilizer with an N-P-K ratio of 10-10-10 or 20-20-20. Fertilize every two weeks during the growing season (spring and summer) and reduce feeding in the fall and winter. Additionally, adding organic matter such as compost to the soil can improve fertility and plant health.
- Hardiness zones: Hibiscus rosa-sinensis is suitable for USDA hardiness zones 9-11. In these zones, the plant can be grown outdoors year-round. In cooler climates, it can be grown as an annual or brought indoors during the winter months.
- Climate requirements: The deep red hibiscus thrives in warm, tropical, and subtropical climates. It requires full sun to partial shade and well-drained soil. The plant prefers temperatures between 60°F and 90°F (15°C to 32°C) and does not tolerate frost.