Chamelaucium uncinatum

Common name: Geraldton wax

Other common names: Bud wax, Waxflower

Description

Waxflower is a flowering shrub or small tree originating in Western Australia, its natural range extending along the coastal strip from Perth to Kalbarri, which lies just north of the town of Geraldton. Nowadays, it is cultivated in Australia, California, Arizona, Israel and South Africa, as an ornamental and for its flowering stems, which are used in floral arrangements.

It is typically a shrub to small tree 1 to 3 m (3 to 10 ft) tall with a much-branched, wide-spreading crown, sometimes as wide as the plant is tall. The foliage consists of dark green needle-like leaves arranged on wispy, woody stems. In tree form, the trunk is slender, often leaning, and the bark grey and fibrous.

The flowers are small with five waxy petals and, as a result of selective cross-breeding, come in white, pink and purple varieties. They bloom from winter to spring in showy clusters at the ends of the branches and are followed by small woody seed capsules containing light brown clove-shaped seed.


Image by Manfred Richter from Pixabay

Use

Waxflower is Australia's best-selling native flower for floral arrangements, both domestically and internationally, with exports of the flowering stems going to Europe, the United States and Japan. They are commonly used as a filler in floral arrangements, mainly as backing for single-stemmed flowers such as roses, and are long-lasting, with a vase life of seven to ten days.

The flowering stems are cut from the plant when the flower buds are fully developed but not yet open. If being shipped, they need to be stored at between 1 and 4°C. On vasing, leaves that would be submerged should be stripped from the stems, and the stems stood in water without a preservative added.


Stems of white waxflowers for sale at the florist (Melbourne, Australia)

Climate

Although naturally adapted to Mediterranean climates with dry summers, it will grow and flower well in dry to moderately humid subtropical climates, generally frost-free areas with annual lows of 9 to 17°C, annual highs of 20 to 33°C, annual rainfall of 300 to 1200 mm and a dry season of 3 to 7 months, extending to 12 months with irrigation.

Growing

New plants are usually started from cuttings as the seed have low viability. Good results have been obtained with semi-hardwood, side-shoot cuttings set in a gritty, inert potting mix such as perlite. Treating the cut end with fungicide and a rooting compound should improve results. A deep container is needed to give the long taproot room to grow and not become root-bound.

Performs best on free-draining loam, sandy-loam, loamy-sand and sand soils of a slightly acid to moderately alkaline nature, generally with a pH of 6 to 8, and on sites with full to partial sun exposure. It has poor tolerance to clay or other slow-draining soils and soils of a strongly acid nature. Over-fertilising before flowering will result in luxurious foliage and few flowers.

Problem features

The seed have low viability, which lowers the risk of the plant escaping cultivation and becoming a problem weed. It is assessed as a low weed risk species for Hawaii by the Hawaii Pacific Weed Risk Assessment (HPWRA) project.

The roots are moderately invasive, and a minimum planting distance of 2 m (6.5 ft) away from any underground pipes or structures is recommended.

Where it grows

With irrigation or groundwater

References

Books

  • Burke, D. 2005, The complete Burke's backyard : the ultimate book of fact sheets, Murdoch Books, New South Wales, Australia

  • Hunter, N. T & Mitchell, H. 1994, The art of floral design, Delmar Publishers, Albany, New York

  • Jex-Blake, A. J. 1957, Gardening in East Africa : a practical handbook, 4th ed., Royal Kenya Horticultural Society, Longmans, Green and Company, London

  • Jones, R. 2001, Caring for cut flowers, 2nd ed, Landlinks Press, Victoria, Australia

  • Mathias, M. E., 1982, Flowering plants in the landscape, University of California Press, Berkeley

  • Oakman, H. 1995, Harry Oakman's what flowers when : the complete guide to flowering times in tropical and subtropical gardens, University of Queensland Press, St. Lucia, Queensland

  • Perry, F. & Hay, R. 1982, A field guide to tropical and subtropical plants, Van Nostrand Reinhold Company, New York

  • Randall, R. P. 2007, The introduced flora of Australia and its weed status, Cooperative Research Centre for Australian Weed Management, Glen Osmond, South Australia

Articles, Journals, Reports and Working Papers

  • Gollnow, B. 2013, Getting Started in Wildflower Growing : How to grow native Australian and South African species for the cut flower market, Rural Industries Research and Development Corporation (RIRDC), Canberra, Australian Capital Territory

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