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Description
Hibiscadelphus giffardianus, commonly known as the Kauai Hibiscus or Giffard’s Hibiscus, is a rare and endangered species of flowering plant native to the Hawaiian island of Kauai. It belongs to the Malvaceae family and is closely related to other Hibiscus species.
Taxonomic Information
| Domain | Eukarya |
|---|---|
| Kingdom | Plantae |
| Phylum | Tracheophyta |
| Class | Magnoliopsida |
| Order | Malvales |
| Family | Malvaceae |
| Genus | Hibiscadelphus |
Appearance
The Kauai Hibiscus is a small tree or shrub that can grow up to 10 feet tall. It has glossy, dark green leaves that are oval-shaped and slightly serrated. The flowers are large, showy, and have a bright yellow color with a red center. The petals are thin and slightly crinkled, and the stamens are long and curved. The flowers bloom in late summer and early fall and are followed by woody seed capsules.
Care Guide
Proper care is essential for the Kauai Hibiscus to thrive. Here are some tips:
- Water: The plant needs regular watering, especially during dry periods. However, overwatering can lead to root rot, so be careful not to let the soil become waterlogged.
- Fertilization: Use a balanced fertilizer every two weeks during the growing season to promote healthy growth and blooming.
- Soil: The Kauai Hibiscus prefers well-draining, fertile soil that is slightly acidic.
- Sunlight: The plant needs full sun to partial shade. Too much shade can lead to poor blooming.
- Hardiness Zones: The Kauai Hibiscus is hardy in USDA Zones 10-11.
Common Pests & Diseases
The Kauai Hibiscus is susceptible to pests such as aphids, mealybugs, and spider mites. It can also develop fungal diseases such as powdery mildew and rust. To prevent and treat these problems, regularly inspect the plant and use an appropriate pesticide or fungicide as needed.
Habitat
The Kauai Hibiscus is endemic to Kauai and is found in dry to mesic forests and on steep slopes. It is a rare and endangered species, with only a few hundred individuals remaining in the wild. The plant is threatened by habitat destruction, invasive species, and climate change.
Question and Answer
Q: Can the Kauai Hibiscus be grown in containers?
A: Yes, the plant can be grown in containers if provided with adequate space and proper care.
Q: How often should the Kauai Hibiscus be pruned?
A: Pruning should be done in late winter or early spring to remove dead or damaged branches and to shape the plant. Avoid pruning during the blooming season.
Q: Is the Kauai Hibiscus a good plant for attracting pollinators?
A: Yes, the plant is attractive to bees and other pollinators.
Q: Can the Kauai Hibiscus be propagated from cuttings?
A: Yes, the plant can be propagated from semi-hardwood cuttings taken in late summer or early fall.
Related Plants
- Hibiscadelphus distans
- Hibiscadelphus wilderianus
- Hibiscus rosa-sinensis
- Hibiscus syriacus
References
- “Hibiscadelphus giffardianus.” IUCN Red List of Threatened Species, www.iucnredlist.org/species/35316/2840186.
- “Hibiscadelphus giffardianus.” National Tropical Botanical Garden, ntbg.org/plants/plant_details.php?plantid=1401.
- “Kauai Hibiscus.” Hawaii Rare Plant Restoration Group, www.kauaiforestbirds.org/kauai-hibiscus.
