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01 Nov 2019 - Essential Oils of the Pacific: Australian Tea Tree

CNN have recently released a video titled 'Essential Oils of the Pacific: Australian Tea Tree'. Please share this as widely as possible and help get the message out there. More »»


18 Aug 2019 - Future Drought Fund

The Australian Government has committed $3.9 billion to the Future Drought Fund; public consultation. To help design the Drought Resilience Funding Plan, register for the upcoming consultation. More »»


07 Aug 2019 - PHA director positions

Every two years, four of the eight non-executive director positions on the Plant Health Australia (PHA Board) are up for re-election. PHA commenced the advertising for upcoming PHA director positions and they have asked ATTIA, as PHA Members, to promote the advertisement. More »»


03 Jul 2019 - Biosecurity Fact Sheets from Plant Health Australia

Plant Health Australia (PHA) continue to develop a Biosecurity Plan for the Australian tea tree industry, the Plan will be released in late 2019. PHA have also generated some fact-sheets for the industry More »»


Growing Tea Trees

Flower _ GD.JPGFlowers of Melaleuca alternifolia         

Melaleuca is a member of the myrtle family of which there are well over 200 species, most of which are endemic to Australia. Depending on the species, they grow as shrubs or trees from between 2 and 30 metres tall. The leaves are evergreen, alternately arranged, dark green to grey-green in colour and ovate to lanceolate in shape. The bark is often flaky and exfoliate (hence the name ‘paper-bark’ for some species of Melaleuca). Flowers, which vary from white thorough yellow or even greenish to pink and red, are produced in dense clusters along the stem with fine, small petals and a tight bundle of stamens which mature to produce a small woody cup-shaped capsule 2 – 3 mm in diameter which is packed with tiny seeds (up to 60 000 per gram). Tea trees are named either from the brown colouration of many watercourses caused by the leaching of tannins from the leaves of this and similar species, or alternatively it has been said that Captain James Cook named the tea tree because he observed the indigenous Bundjalung people of eastern Australia use the leaves to prepare a healing tea.

 Tea tree oil is seam distilled from Melaleuca alternifolia commercially, it can also be distilledfrom M. linariifolia.  ATTIA members produce their pure Australian tea tree oil almost exclusively from M alternifolia which occurs naturally in a relatively small area of New South Wales, Australia.

100 % pure Australian tea tree oil should not be confused with cajeput oil (extracted from M. quinquenervia), niaouli oil (M. viridiflora), kanuka oil (Kunzea ericoides), or manuka oil (Leptospermum scoparium).

TT growth.jpg

 

 

In the early days (see History for more details) of the tea tree industry, the oil was manually harvested from natural stands of M. alternifolia and distilled in crude bush stills. Improvements in seed cultivars and increased worldwide demand for the oil led to commercial plantations being developed, initially from seed harvested from natural stands, but more recently using improved seed from the jointly funded ATTIA, RIRDC and DPI Tea Tree Breeding Program which has improved oil yields by up to 90%. This critical improvement has enabled the Australian tea tree industry to maintain a competitive edge while preserving the natural environmental balance to sustain and maintain future resources.

 

 

 

Closeup of a stand of plantation M alternifolia

 

TT seedlings 6 weeks.JPGThe tiny seeds are germinated in specialist nurseries by either soaking the seed in aerated water for several days to soften the hard exterior coat before being diluted in a gel or alternatively by mixing the seed thoroughly with a diluent (usually fine sand) and planting them out into seedling cells to germinate.  

 

 

 Tea tree seedlings at 6 weeks

   TT seedlings 6 weeks #2.JPG

When they are about 2 – 4 weeks old, the seedlings are thinned to one per cell and grown for between 2 to 4 months to ensure they are vigorous enough to survive transplanting into prepared fields at planting rates of 25 000 – 35 000 trees per hectare depending on the climate and soil type.

 

 

Close up of tea tree seedlings at 6 weeks

 

 TT seedlings 5 months.JPGTT seedlings 5 months #2.JPG Tea tree seedlings at 6 months - well grown and ready to leave the nursery to be transplanted into prepared fields

 

 

 

 Seedlings are delivered and planted into specially prepared paddocks in 1 metre row spacingsplanting closeup.JPG

ready to plant.JPG

 

 

 

 

 

 

 

 

 

 watering in.JPG 

 

 

Before being watered in

 

 

 

  transplanted seedling.JPG

 

 

A closeup of a newly transplanted seedling

 

 

 

 Photos courtesy of P Bolster and T Dougherty 2009©

 

 

 

 

Young plantation_ GD.JPG

Once established, the trees quickly form a dense cover that often excludes weeds and over the next 12-14 months grow to a height of 2 to 2.5 meters before being harvested for the first time. The trees are robust and regenerate quickly after this first harvest. Trees are harvested annually. Yield improves over the next 2 – 3 years as the trees establish a strong network of roots and coppice post-harvest to form several shoots from the root stock. 

 

Plantation of M alternifolia a few months after establishment

 

 

Clarence near Ulmarra.JPG

Flooding on the Clarence river near Ulmarra in April 2009

Tea trees are susceptible to damage from some insect pests and oil yields can be reduced by adverse events like prolonged flooding or drought. Flood damage varies depending on the depth and duration of inundation. There have been  two recent flood events, one in January 2008 that caused widespread damage to a number of plantations which resulted in loss of many hectares of productive plantations and another in April 2009 which, while devastating to many communities, did not result in widespread loss or damage to plantations possibly because the flood occurred in winter when the water is cooler and also the flood waters receded relatively quickly.

 Photo courtesy of North East Agricultural Services 2009©

 

 

Page last updated: 08 May 2017