Lavender growing for oil production - Platypus Country

Lavender growing for oil production
AG0450
quality products in smaller volumes will result in higher
prices being realised. The developing aromatherapy
market is an area that lends itself to such market targeting.
Uses
The oils from lavender, lavandin and spike lavender have
long been used separately and in combination with other
essential oils in the fragrance and perfumery industry.
Minor uses, in terms of quantity, include aromatherapy
which relies on the sedative effects of lavender oil
vapours. The most likely component to be active in this
regard is linalool.
Production of lavender
The following notes relate to production of lavender oil
under Australian conditions. There is very little data
available on the production of lavandin and spike lavender
in Australia.
Cultural requirements
Lavender requires free-drainage and less irrigation than
most essential oil crops. The plants have a deep rooting
system and are tolerant to both moderate frosts and
drought. Severe frosts will affect the plants. Soils of
neutral (7) pH are preferred but successful crops have been
produced over the range 5.8 to 8.3pH. Nutrition of
lavender crops will normally involve some additional
phosphorus (P) (about 33kg/ha actual P in Tasmania) and
potassium (K), however the actual amounts will vary with
soil types. Nitrogen (N) will need to be supplied in up to
four split dressings throughout the growing season and
could total
80-100kg/ha of actual N each year. Care should be taken
to produce the appropriate balance of flowers and leaves.
Experience on a given soil type and geographic region will
be required to get the best production of oil.
Propagation
Propagation is normally accomplished by taking cuttings
from known genetic sources in winter. Fields are planted
in rows 1-1.2m apart with intra-row spacing of 0.4m at an
approximate density of approximately 20,000 plants/ha.
The first year of the plantation should be for establishment.
Harvest in the second year will depend on the rootstock
vigour of a particular stand. The life span of lavender
plants is 10-15 years after which replacement plantings
may be required.
Attention to obtaining the correct genotype is essential as
recognised markets are only open to oil that closely
resembles the international standards. Sources of the
preferred genotype are currently not easily available.
Pest and diseases
There are several disease and pest problems that occur in
overseas plantations. Australian plantings have been
relatively free from pests.
An exception found in the Tasmania lavender oil
producing area is the light brown apple moth Epiphyas
postvittana, a pest of significant proportion (in apple
growing areas), which may require some control measures
if found on lavender. Root diseases, Fusarium sp. and
Armillaria sp. have been a problem but selections of
resistant plant types can reduce this problem. The soil
nematode, Meloidogyne hapla, has been reported as a
potential threat to lavender production in India but has not
yet been a problem in Australia.
Weed control
Lavender does not offer good competition for weeds,
therefore attention to weed control is very important.
Apart from nutrient and water competition between
lavender and weeds, there is considerable risk of
contamination from the weed species in the distilled oil
product if weeds are allowed to grow in the rows.
Harvest
A dedicated harvester that lifts and clips only the flowering
stems has been developed in Tasmania and would be
needed to efficiently harvest the crop. Over two tonnes of
flower heads per hour is achieved using the Tasmanian
harvester. Yields of 0.8% oil from fresh flowers have been
reported.
Typical lavender oil yields of 50kg/ha can be expected
from mature plantings. The highest lavender oil yield
obtained in Tasmania is reported to be over 70kg/ha.
Harvest commences from mid-December to early-January
depending on seasons in Tasmania.
Extraction
a. Steam distillation
The oil is released from the oil glands in the flower heads
using steam distillation. Speedy extraction of the oil has
some quality benefits. Normal steam distillation
equipment as used in the peppermint and eucalyptus oil
industries can be used for lavender oil extraction. Trial
distillations of lavender oil have been performed
successfully at the Ovens Research Station from locally
produced lavender crops.
Laboratory-scale distillation units that process 3kg of
flowers at a time are well suited to varietal selection work.
These units can be bought or assembled from readily
available parts for a few hundred dollars. Equipment for
commercial distillation operations would start at a 0.5
tonne distillation plant which could be constructed for
approximately $10,000 and a fully commercial distillation
unit that would hold up to 8 tonne of flowers could cost
$300,000.
A permit to have distillation facilities is required from the
Licensing Clerk, Australian Custom Service, GPO Box
2809AA, Melbourne, 3001. The permit must be applied
for before constructing distillation equipment.
b. Solvent extraction
A smaller quantity of lavender and lavandin concretes are
produced in Southern France by solvent extractions.
Concretes are extracted from fresh plant material using
solvents such as toluene, hexane and petroleum ether. The
solvents are evaporated off leaving residues called
© State of Victoria, Department of Primary Industries Page 2