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Eucalyptus caesia

Common name:	Gungurru	Family:	Myrtaceae
Author:	Benth.	Botanical references:	200
Synonyms:
Known Hazards:	Citronellal, an essential oil found in most Eucalyptus species is reported to be mutagenic when used in isolation[269]. In large doses, oil of eucalyptus, like so many essential oils has caused fatalities from intestinal irritation[269]. Death is reported from ingestion of 4 - 24 ml of essential oils, but recoveries are also reported for the same amount[269]. Symptoms include gastroenteric burning and irritation, nausea, vomiting, diarrhoea, oxygen deficiency, ,weakness, dizziness, stupor, difficult respiration, delirium, paralysis, convulsions, and death, usually due to respiratory failure[269].
Range:	W. Australia.
Habitat:	Granite outcrops, succeeding in sands, sandy loams and some clays as well as in areas of low rainfall[77].
Edibility Rating (1-5):	1	Medicinal Rating (1-5):	0

Other Common Names:	From various places around the Web, may not be correct. See below.
	Gungurru [H],
Epithets:	From a Dictionary of Botanical Epithets
	caesia = bluish gray
Systematics:	From a USDA Plants Database
	Order: Myrtales. Myrtle family

Physical Characteristics

An evergreen tree growing to 10m at a fast rate. It is hardy to zone 9. It is in leaf all year. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Bees. It is noted for attracting wildlife. We rate it 1/5 for edibility and 0/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils, requires well-drained soil and can grow in nutritionally poor soil. The plant prefers acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It requires dry moist or wet soil and can tolerate drought.

Habitats and Possible Locations

Bog Garden, Woodland, Canopy, Secondary.

Edible Uses

Root.

Bark of young roots - baked and then ground. A sweet malt-like flavour[144].

Medicinal Uses

Disclaimer

None known

Other Uses

None known

Cultivation details

Prefers a sunny position in a moderately fertile well-drained moisture retentive circum-neutral soil[200]. Tolerates poor and dry soils, especially those low in mineral elements[200]. A drought tolerant plant once established[200], but it is not very wind resistant[77].
Plants are hardy to at least -7° c in Australian gardens[77, 157], but they are almost certainly not so hardy in Britain because of our cooler summers and colder, wetter winters. However, plants do experience frost and snow in their native habitat[200] and so it might be worthwhile giving them a try in the mildest areas of the country.
Eucalyptus species have not adopted a deciduous habit and continue to grow until it is too cold for them to do so. This makes them more susceptible to damage from sudden cold snaps. If temperature fluctuations are more gradual, as in a woodland for example, the plants have the opportunity to stop growing and become dormant, thus making them more cold resistant. A deep mulch around the roots to prevent the soil from freezing also helps the trees to survive cold conditions[200]. The members of this genus are remarkably adaptable however, there can be a dramatic increase in the hardiness of subsequent generations from the seed of survivors growing in temperate zones[200].
Eucalyptus monocultures are an environmental disaster, they are voracious, allelopathic and encourage the worst possible attitudes to land use and conservation[200].
Plants are shallow-rooting and, especially in windy areas, should be planted out into their permanent positions when small to ensure that they do not suffer from wind-rock[245]. They strongly resent root disturbance and should be container grown before planting out into their permanent position[11].
The flowers are rich in nectar and are a good bee crop[200].

Propagation

Seed - surface sow February/March in a sunny position in a greenhouse[11, 78, 134]. Species that come from high altitudes appreciate 6 - 8 weeks cold stratification at 2° c[200]. Pot up the seedlings into individual pots as soon as the second set of seed leaves has developed, if left longer than this they might not move well. Plant out into their permanent positions in early summer and give them some protection from the cold in their first winter. The seed can also be sown in June, the young trees being planted in their final positions in late spring of the following year. The seed has a long viability[200].

Suppliers

For more details of plant suppliers please see our Suppliers Page which lists many more places to look.

Web References

[H] Details of Scandanavian and European Common names in Henriette's names database
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for the family Myrtaceae.

To be included in the Flora of China.

See the PFAF Links Pages for other sources.

Also try Photos and info from the The Plants Database which has 14,000 images.

References

[11] Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981
A classic with a wealth of information on the plants, but poor on pictures.

[77] Kelly. S. Eucalypts. (2 volumes.) Nelson, Melbourne 1969
A very readable book (in two volumes) on the many species of Eucalyptus trees in Australia.

[78] Sheat. W. G. Propagation of Trees, Shrubs and Conifers. MacMillan and Co 1948
A bit dated but a good book on propagation techniques with specific details for a wide range of plants.

[134] Rice. G. (Editor) Growing from Seed. Volume 2. Thompson and Morgan. 1988
Very readable magazine with lots of information on propagation. An interesting article on Ensete ventricosum.

[144] Cribb. A. B. and J. W. Wild Food in Australia. Fontana 1976 ISBN 0-00-634436-4
A very good pocket guide.

[157] Wrigley. J. W. and Fagg. M. Australian Native Plants. Collins. (Australia) 1988 ISBN 0-7322-0021-0
A lovely book, written in order to encourage Australian gardeners to grow their native plants. A little bit of information for the plant project.

[200] Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992 ISBN 0-333-47494-5
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

[245] Genders. R. Scented Flora of the World. Robert Hale. London. 1994 ISBN 0-7090-5440-8
An excellent, comprehensive book on scented plants giving a few other plant uses and brief cultivation details. There are no illustrations.

[269] Duke. J. Handbook of Energy Crops - 1983
Published only on the Internet, excellent information on a wide range of plants.

Readers Comments

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Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
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