Common name: Rose Gum

Rose Gum is a large timber tree native to Australia, where it occurs in forest pockets on the eastern fringe of the continent, extending from the subtropics to the tropics. 

In natural forests, it is frequently taller than 40 m (130 ft), with exceptional specimens reaching heights above 60 m (197 ft) and is fast-growing on favourable sites averaging up to 2 m (6.5 ft) in height per year.

The trunk is usually straight, well-formed, branch-free for up to three-quarters of the tree's height and supports a moderately branched, rounded crown. The bark is peeling, revealing smooth new bark in shades of white, pale grey, brown and light green, depending on the stage of weathering.

As with most eucalypts, the leaves remain on the tree in all seasons and change shape as the plant matures. This species ranges from small, green, slim ovate leaves on seedling plants to narrowly lance-shaped leaves up to 20 cm (8 in) long on adult trees.

The flowers are typical of eucalypts, with long, creamy-white filaments arising from a cup-shaped base and are bisexual, with both male and female parts. They come into bloom from late summer to winter, with delayed blooms at high elevations and are followed by small, woody, cone-shaped seedpods.

^{The Domain, Melbourne, Australia}

Use

Rose Gum is a widely cultivated hardwood species grown globally in many warm-climate regions, including plantations in Australia, India, Africa, and Brazil. 

Depending on the maturity, the wood is light- to medium-weight, in the 480 to 600 kgs per cubic meter (30 to 37 lbs per cubic ft) range and has moderate natural resistance to rot and decay.

The sawn timber is used in heavy and light construction, including house frames, interior joinery, furniture and cabinets, and for making boxes. The small-diameter roundwood is cut for posts and poles, such as fence posts, tall poles for carrying electricity and telecommunications cables, and as well as for firewood, charcoal, decorative veneer and pulp used in the manufacture of paper. It is also cultivated in Florida to supply mulch wood for the landscaping and gardening trade.

The flowers produce nectar and pollen for bee forage. In South Africa, it is classed as a major honey plant, with honey yields averaging around 50 kg (110 lbs) per colony per season. However, yields are low in Australia, where it is classed as a minor honey plant. The honey is pale to medium amber, relatively thin and with a strong, slightly unpleasant flavour. The honey properties vary significantly between low and high elevation areas. Trees at high elevation reportedly produce a lighter coloured, often better-flavoured honey, presumably due to lesser temperature extremes.

Climate

Grows naturally in humid subtropical and tropical climates, generally areas with annual lows of 9 to 20°C, annual highs of 19 to 32°C, annual rainfall of 700 to 3800 mm and a dry season of 7 months or less, extending to 12 months with irrigation or groundwater.

Growing

New plants are usually started from seed, which remain viable for several years if stored under cold, dry, airtight conditions. Rose Gum tolerates seasonal flooding and has a slight tolerance to soil salt. Growth appears unaffected on soils with salinity levels the equivalent of up to 3 grams of salt per litre of water.

Performs best on free-draining acid to neutral sand, loam and clay soils of an acid to neutral nature, generally with a pH of 5.5 to 7.0 and on sites with full to partial sun exposure.

Problem features

Seed production is prolific, and the seed germinate readily. It is recorded as having naturalised in New Zealand and as a weed in Southern Africa. And it is assessed as a high weed risk species for Hawaii and Florida, respectively, by the Hawaii Pacific Weed Risk Assessment (HPWRA) project and the IFAS Assessment of Non-Native Plants in Florida's Natural Areas.

Rose Gum is not recommended for planting in home gardens because of its large size and tendency to drop its branches in strong winds.

Books

• Blake, S. T. & Roff, C. 1987, The honey flora of Queensland, 3rd ed., Queensland Department of Primary Industries (QLD DPI), Brisbane

• Boland D.J., Brophy J.J. & House A. P. N. 1991, Eucalyptus leaf oils, use, chemistry, distillation and marketing, Australian Centre for International Agricultural Research (ACIAR) & Commonwealth Scientific Industrial Research(CSIRO), Inkata Press, Melbourne

• Boland, D. & Brooker, I. & McDonald, M. W. 2006, Forest trees of Australia, 5th ed., CSIRO Publishing (Ensis), Melbourne

• Burns R.M., Mosquera M.S. & Whitmone J.L. 1998, Useful trees of the tropical region of North America, North American Forestry Commission Publication (Number 3), Washington D.C.

• Burns, R.M. & Honkala, B.H. 1990, Silvics of North America (Volume 2) : Hardwoods, Agricultural Handbook 654, U.S. Department of Agriculture (USDA), Washington D.C.

• Clarke, B. & McLeod, I. & Vercoe, T. 2009, Trees for farm Forestry : 22 Promising Species, Rural Industries Research and Development Corporation (RIRDC), Wagga Wagga, New South Wales

• Clemson, A. 1985, Honey and pollen flora, New South Wales Department of Agriculture, Inkata Press, Melbourne

• Crane, E., Walker, P. & Day, R. 1984, Directory of important world honey sources, International Bee Research Association, London

• Francis, J. K. 1998, Tree species for planting in forest, rural, and urban areas of Puerto Rico, U.S. Department of Agriculture, Forest Service, International Institute of Tropical Forestry, Río Piedras, Puerto Rico

• Holliday, I. 2002, A field guide to Australian trees, 3rd revised editon, New Holland Publishers, Frenchs Forest, New South Wales

• Jensen, M. 1999, Trees commonly cultivated in Southeast Asia : an illustrated field guide, 2nd ed., Food and Agricultural Organisation of the United Nations (FAO) Regional Office for Asia and the Pacific (RAP), Bangkok

• Lemmens, R.H.M.J., Louppe, D. & Oteng-Amoako, A.A. (eds). PROTA, Plant Resources of Tropical Africa, Volume 7(1) : Timbers 1, PROTA Foundation, Backhuys Publishers, Leiden

• Liegel, L. H. 1987. A technical guide for forest nursery management in the Caribbean and Latin America, U.S. Dept. of Agriculture, Forest Service, Southern Forest Experiment Station, New Orleans

• Luna, R. K 1996, Plantation trees, International Book Distributors, Dehradun, Uttarakhand

• Marcar, N. E. 1995, Trees for saltland : a guide to selecting native species for Australia, Division of Forestry, Commonwealth Scientific and Industrial Research Organisation (CSIRO) Australia, Canberra

• Menninger, E. A. 1967, Fantastic trees, Viking Press, New York

• National Research Council (Board on Science and Technology for International Development) 1980, Firewood crops : shrub and tree species for energy production (Volume 1), The National Academies Press, Washington D. C.

• Porter, T. 2012, Wood : identification & use, Compact edition, Guild of Master Craftsman Publications, Lewes, East Sussex

• Randall, R. P. 2002, A global compendium of weeds, R.G. and F.J. Richardson Press, Melbourne

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

• Roecklein, J. C & Leung, P.S. 1987, A Profile of economic plants, Transaction Books, New Brunswick, New Jersey

• Scheffer, T. C & Morrell, J. J. 1998, Natural durability of wood : a worldwide checklist of species, Forest Research Laboratory, Oregon State University, Corvallis, Oregon

• Webb, D. B. 1984, A Guide to species selection for tropical and sub-tropical plantations, 2nd ed., Unit of Tropical Silviculture, Commonwealth Forestry Institute, University of Oxford, Oxfordshire