aquatic

Swamp Rosemallow

Hibiscus grandiflorus

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Swamp Rosemallow (Hibiscus grandiflorus) at Rice Road Greenhouses

Swamp Rosemallow flowers

Swamp Rosemallow flowers

(Photo courtesy of NetPS Plant Finder)

Height:  10 feet

Spread:  3 feet

Sunlight:  full sun  partial shade 

Hardiness Zone:  7b

Other Names:  Giant Rosemallow, Velvet Mallow, Swamp Hibiscus

Description:

This bold water friendly plant features large, felty, gray green leaves; grows quite tall, and is crowned with large pale pink blooms in summer; great for a garden that is kept moist until it is established, or in pondside areas; do not allow to dry out

Ornamental Features

Swamp Rosemallow features bold white star-shaped flowers with shell pink overtones and crimson eyes at the ends of the stems from late spring to early fall. Its large tomentose lobed leaves remain grayish green in colour with curious gray undersides throughout the year. The fruit is not ornamentally significant.

Landscape Attributes

Swamp Rosemallow is an herbaceous evergreen perennial with a rigidly upright and towering form. Its relatively coarse texture can be used to stand it apart from other garden plants with finer foliage.

This plant will require occasional maintenance and upkeep, and is best cleaned up in early spring before it resumes active growth for the season. It is a good choice for attracting butterflies and hummingbirds to your yard. Gardeners should be aware of the following characteristic(s) that may warrant special consideration;

  • Insects
  • Self-Seeding

Swamp Rosemallow is ideally suited for growing in a pond, water garden or patio water container, and is recommended for the following landscape applications;

  • Accent
  • Mass Planting
  • General Garden Use
  • Water Gardens
  • Naturalizing And Woodland Gardens
  • Container Planting
  • Bog Gardens

Planting & Growing

Swamp Rosemallow will grow to be about 10 feet tall at maturity, with a spread of 3 feet. It has a low canopy with a typical clearance of 1 foot from the water. It grows at a fast rate, and under ideal conditions can be expected to live for approximately 5 years.

This plant does best in full sun to partial shade. As an aquatic plant, it requires a suitable water garden environment and will benefit from special planting and ongoing care practices; consult one of our in-store experts for further details and instructions. It is not particular as to soil type or pH, and is able to handle environmental salt. It is highly tolerant of urban pollution and will even thrive in inner city environments. Consider applying a thick mulch around the root zone in winter to protect it in exposed locations or colder microclimates. This species is native to parts of North America.

Swamp Rosemallow is a fine choice for the water garden, but it is also a good selection for planting in outdoor pots and containers. Its large size and upright habit of growth lend it for use as a solitary accent, or in a composition surrounded by smaller plants around the base and those that spill over the edges. Note that when grown in outdoor pots and containers, aquatic plants like this one will require a special growing environment that meets their requirement for consistent moisture. Be aware that in our climate, this plant may be too tender to survive the winter if left outdoors in a container. Contact our store for more information on how to protect it over the winter months.

 
 
Hardiness Zone Plant Height Minimum Sunlight
Characteristics
Accent  Massing  Garden  Naturalizing  Container  Bog  Water 
Applications
Flowers  Texture  Attracts Wildlife 
Ornamental Features