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perennial

Onyx Foamy Bells

Heucherella 'Onyx'

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Onyx Foamy Bells (Heucherella 'Onyx') at Van Atta's Greenhouse

Onyx Foamy Bells

Onyx Foamy Bells

(Photo courtesy of NetPS Plant Finder)

Plant Height:  10 inches

Flower Height:  15 inches

Spacing:  12 inches

Sunlight:  partial shade  full shade 

Hardiness Zone:  4

Brand:  Terra Nova

Description:

Dainty spikes of white bells rise from a medium sized mound of glossy, true black, deeply cut leaves; presents amazing contrast to other plants and has great versatility; great foliage for mixed containers

Ornamental Features

Onyx Foamy Bells features dainty spikes of white bell-shaped flowers rising above the foliage from early to mid summer. The flowers are excellent for cutting. Its attractive deeply cut lobed leaves emerge burgundy in spring, turning black in color with curious burgundy undersides and tinges of plum purple the rest of the year. The fruit is not ornamentally significant. The black stems can be quite attractive.

Landscape Attributes

Onyx Foamy Bells is a dense herbaceous evergreen perennial with tall flower stalks held atop a low mound of foliage. Its relatively fine texture sets it apart from other garden plants with less refined foliage.

This is a relatively low maintenance plant, and should be cut back in late fall in preparation for winter. It is a good choice for attracting hummingbirds to your yard. It has no significant negative characteristics.

Onyx Foamy Bells is recommended for the following landscape applications;

  • Mass Planting
  • Rock/Alpine Gardens
  • Border Edging
  • General Garden Use
  • Groundcover
  • Container Planting

Planting & Growing

Onyx Foamy Bells will grow to be about 10 inches tall at maturity extending to 15 inches tall with the flowers, with a spread of 16 inches. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 12 inches apart. Its foliage tends to remain low and dense right to the ground. It grows at a medium rate, and under ideal conditions can be expected to live for approximately 10 years.

This plant does best in partial shade to shade. It prefers to grow in average to moist conditions, and shouldn't be allowed to dry out. It is not particular as to soil type or pH. It is somewhat tolerant of urban pollution. Consider covering it with a thick layer of mulch in winter to protect it in exposed locations or colder microclimates. This particular variety is an interspecific hybrid. It can be propagated by division; however, as a cultivated variety, be aware that it may be subject to certain restrictions or prohibitions on propagation.

Onyx Foamy Bells is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. It is often used as a 'filler' in the 'spiller-thriller-filler' container combination, providing a mass of flowers and foliage against which the larger thriller plants stand out. Note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden.

 
 
Hardiness Zone Plant Height Minimum Sunlight
Characteristics
Massing  Rock  Edging  Garden  Groundcover  Container 
Applications
Flowers  Foliage Color  Texture  Plant Form  Bark  Attracts Wildlife 
Ornamental Features