Perennial hibiscus, also known as hardy hibiscus or rose mallow, are herbaceous flowering plants in the Hibiscus genus that are native to North America. Here's some information about perennial hibiscus:

1. Appearance: Perennial hibiscus are known for their large, showy flowers and attractive foliage. They typically grow as bushy, clump-forming plants with erect stems. The leaves are deep green, heart-shaped, and often have serrated edges. The flowers are large and trumpet-shaped, measuring 6 to 12 inches (15 to 30 cm) across. They come in various colors, including shades of white, pink, red, and even bicolor varieties.

2. Height: Perennial hibiscus can vary in height depending on the variety, but they generally range from 3 to 6 feet (0.9 to 1.8 meters) tall and about 2 to 4 feet (0.6 to 1.2 meters) wide.

3. Blooms: Perennial hibiscus bloom from midsummer to fall, producing large, colorful flowers that are attractive to pollinators like bees and butterflies. The blooms typically last for one day but are produced continuously throughout the blooming season.

4. Sunlight: Perennial hibiscus prefer full sun to partial shade. They require at least 6 hours of direct sunlight per day to bloom profusely. In hotter climates, some afternoon shade can help protect the plants from heat stress.

5. Soil: Perennial hibiscus prefer well-draining soil that is rich in organic matter. They can tolerate various soil types, including loamy, sandy, or clay soils, as long as the drainage is good. Amending the soil with compost or organic matter can improve soil fertility and structure.

6. Watering: Perennial hibiscus have moderate water needs. Water them deeply and thoroughly when the soil feels dry to the touch, but avoid waterlogged conditions. Once established, they are relatively drought-tolerant.

7. Fertilizing: Perennial hibiscus benefit from occasional fertilization to promote healthy growth and flowering. Apply a balanced, slow-release fertilizer in spring, following the package instructions. Avoid high-nitrogen fertilizers, as they can promote excessive foliage growth at the expense of flowers.

8. Pruning: Pruning requirements for perennial hibiscus are minimal. You can remove any dead or damaged stems in late winter or early spring before new growth emerges. Light pruning may also be done to shape the plant or remove any unwanted growth.

9. Winter Care: Perennial hibiscus are hardy in USDA zones 4-9. In colder regions, they may die back to the ground in winter and regrow from the base in spring. Mulching around the base of the plants can help protect the roots from freezing temperatures.

Overall, perennial hibiscus are valued for their large, colorful flowers, long blooming season, and easy care requirements, making them a popular choice for gardeners looking to add a tropical flair to their landscapes.