A native of eastern Australia, the Lemon Eucalyptus tree yields valuable essential oil, wood and nectar for honey production.
There are two subspecies recognised, Corymbia citriodora subsp. variegata, with a natural range limited to the subtropics and Corymbia citriodora subsp. citriodora, with a more expansive range that extends from the subtropics to the hilly tropics.
It is fast-growing and may become a large tree, reaching heights of up to 50 m (165 ft) in natural woodland and forest habitats, though is more commonly 20 to 30 m (65 to 100 ft) tall.
The trunk is usually straight, slender, mostly branch-free and with flaking bark that exposes smooth creamy-white, pink or bronzed coloured bark underneath, depending on the amount of weathering that has occurred. The branches are few and ascending, forming an open, rounded, moderately leafy crown.
The leaves are typical of oil-yielding Eucalyptus, being dull green with a narrow blade shape and those of subsp. citriodora have a strong lemon fragrance when crushed.
From winter to spring, small powder-puff-like flowers with long white stamens come into bloom and are followed by urn- or egg-shaped woody seed capsules enclosing small, glossy, reddish-black seed.
The leaves of subsp. citriodora yield commercial quantities of a lemon-scented essential oil extracted by steam distillation. The oil is used mainly as a fragrance component in perfume and toiletry products and as raw material for the production of menthol. A high citronellal content also gives it natural insect repellent properties.
About 10,000 to 25,000 kilograms of fresh leaves are harvested per hectare per year in commercial plantations and with an average oil content of 1% yields 100 to 250 kilograms of oil, the equivalent of 90 to 220 pounds of oil per acre.
Both subspecies produce a heavy wood in the 800 to 1000 kg per cubic meter (50 to 62 lb per cubic ft) range, with high natural resistance to decay and wood-boring insects. This classes it as a durable hardwood suitable for indoor and outdoor construction. The sapwood is whitish and the heartwood light to dark red-brown with attractive, wavy figuring.
Well-formed logs are sawn into beams and planks used for heavy and light construction, railway sleepers, house framing, as well as internal and external flooring or decking. Smaller diameter roundwood is cut for transmission poles, fence posts, high impact tool handles and for fuelwood, either for firewood or for making charcoal, which burns steadily and produces little ash.
The flowers serve as a valuable source of pollen for brood-rearing honeybees and as a source of nectar for honey production, in its native Australia, as well as in countries where the tree is an introduced species. It is reported as a major, introduced honey plant in Brazil, Madagascar and Mauritius, with honey yields per hectare of trees estimated at around 113 kgs (249 lbs) per year. The honey is light to medium amber in colour, firm-textured with a fair flavour and is slow to granulate to a coarse brown grain.
It is sometimes cultivated in large gardens as a landscape tree on account of its slender, erect form and smooth cream-coloured bark.
Grows naturally in moderately humid subtropical and tropical mid-elevation climates, generally best in areas with annual lows of 10 to 19 °C, annual highs of 19 to 32 °C, annual rainfall of 600 to 2300 mm and a dry season of 7 months or less, extending to 12 months with irrigation.
New plants are usually started from seed, which are tiny and don't require a covering of soil to germinate but benefit from soaking in water overnight. Performs best on free-draining loam and sand soils of a moderately acid to slightly alkaline nature, generally with a pH of 5 to 7.5 and on sites with full sun exposure.
Large amounts of small seed are produced and fall to the ground where they germinate readily. It is assessed as a high weed risk species for Hawaii and Florida, respectively by the Hawaii Pacific Weed Risk Assessment project (HPWRA) and the IFAS Assessment of Non-Native Plants in Florida's Natural Areas.
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
Clemson, A. 1985, Honey and pollen flora, New South Wales Department of Agriculture, Inkata Press, Melbourne
Coppen J.J.W. 1995, Flavours and fragrances of plant origin, Non-wood forest products (Volume 1), Food and Agriculture Organization of the United Nations (FAO), Rome
Crane, E., Walker, P. & Day, R. 1984, Directory of important world honey sources, International Bee Research Association, London
Debboun, M. & Frances, S. P. & Strickman, D. 2006, Insect repellents : principles, methods, and uses, CRC Press, Boca Raton, Florida
Duke, J. A. 1983, Handbook of energy crops (unpublished), Center for New Crops & Plants Products, Purdue University, West Lafayette, Indiana
Elevitch, C. R & Wilkinson, K. M. 2000, Agroforestry guides for Pacific Islands, 1st ed., Permanent Agriculture Resources, Holualoa, Hawaii
Farooqi, A. A. & Sreeramu, B. S. 2004, Cultivation of medicinal and aromatic crops, Hyderabad University Press, Hyderabad
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, Piedras, Puerto Rico
Gilman, E. F. 1997, Trees for urban and suburban landscapes, Delmar Publishers, Albany, New York
Holliday, I. 2002, A field guide to Australian trees, 3rd revised editon, New Holland Publishers, Frenchs Forest, New South Wales
Krishen, P. 2006, Trees of Delhi : a field guide, Dorling Kindersley Publishers, Delhi
Leech, M. 2013, Bee Friendly: A planting guide for European honeybees and Australian native pollinators, Rural Industries Research and Development Corporation (RIRDC), Canberra, Australian Capital Territory
Little, E. L. & Skolmen, R. G. 1989, Common forest trees of Hawaii (native and introduced), Agricultuural Handbook No. 679, Forest Service, U.S. Department of Agriculture, Washington, D.C.
Little, E. L. 1974, Trees of Puerto Rico and the Virgin Islands, Vol. 2, United States Department of Agriculture (USDA), Washington D.C.
Little, E.L. Jr. 1983, Common fuelwood crops: a handbook for their identification, McClain Printing Company, Parsons, West Virginia
Macmillan, H. F. 1943, Tropical planting and gardening : with special reference to Ceylon, 5th ed, Macmillan Publishing, London
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.
Oyen, L. P. A. & Nguyen X. D. 1999, Plant Resources of South-East Asia (PROSEA) 19 : Essential-oil plants, Backhuys Publishers, Leiden
Peate, N. & Macdonald, G. & Talbot, A. 2006, Grow what where : over 3,000 Australian native plants for every situation, special use and problem area, 3rd ed., Bloomings Books, Richmond, Victoria, Australia
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
Rauch, F. D. & Weissich, P. R. 2000, Plants for tropical landscapes : a gardener's guide, University of Hawaii Press, Honolulu
Reyes, G. 1992, Wood densities of tropical tree species, U.S. Department of Agriculture, Forest Service, Southern Forest Experiment Station, New Orleans, Louisiana
Scheffer, T. C & Morrell, J. J. 1998, Natural durability of wood : a worldwide checklist of species, Forest Research Laboratory, Oregon State University, Corvallis, Oregon
Sheikh M. I. 1993, Trees of Pakistan, USAID Forestry Planning and Development Project, Pictorial Printers, Islamabad
Stewart, A. 2013, The drunken botanist : the plants that create the world's great drinks, 1st ed., Algonquin Books, Chapel Hill, North Carolina
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
Douglas M. & Heyes J. & Smallfield B. 2005, Herbs, Spices and Essential Oils Post-Harvest Operations in Developing Countries, Food and Agriculture Organization of the United Nations (FAO), Rome
This website is provided for general information only. Iplantz makes no statements, representations or warranties as to the accuracy or completeness of the content of this website and does not accept any liability to you or any other person for the information which is provided or referred to on this website.
In particular, Iplantz does not represent or warrant that any dataset or the data it contains is accurate, authentic or complete, or suitable for your needs. Changes in circumstances after the time of publication may impact the accuracy of datasets and their contents.
To the maximum extent permitted by law, Iplantz accepts no liability whatsoever to any person arising from or connected with the use of or reliance on any information or advice provided on this website or incorporated into it by reference, including any dataset or data it contains. No responsibility is taken for any information or services that may appear on any linked websites.