There are four dominant tree species through the Western Australia’s
South West region – Jarrah, Karri, Tingle and Tuart. All are unique
to Western Australia and support a diverse range of fauna and other
flora species in their associated forests.
The diverse ecosystem of the Jarrah forest is so named after the
dominant tree species ‘Jarrah’ or Eucalyptus Marginata. The Jarrah
tree grows up to 40 metres in height (130 feet) and can live to up
to 1,000 years old. They are only found in the south west corner of
Jarrah forests include other tree species such as
Marri, a eucalypt which grows up to 60 metres. Jarrah trees are
prized for their rich red timber which has seen them extensively
logged. Excellent examples of Jarrah forest can be found through the
Collie River Valley and around the town of Nannup.
The Southern Forests area of Australia’s South West is well known
for its majestic Karri forests. Growing up to 90 metres tall the
smooth barked Karri tree (Eucalyptus Diversicolor) is the tallest
tree in Western Australia and one of the world’s tallest hardwood
trees. They are typically found between Manjimup and Denmark but
outlying populations are found as far west as Margaret River, in the
Boranup forest, and as far east as the Porongurup National Park.
(Western Australian variety, also known as the Yarri, WA Black Butt,
or Swan River Black Butt) is one of the taller eucalypts, growing up
to 40-45 meters high. It is one of the least flammable eucalypts and
usually survives moderate forest fires, although the base of the
tree becomes blackened, giving the tree its name.
The Black Butt
tree itself resembles the Jarrah, but is relatively scarce as
it was a favourite timber for farmers, railway wagons, bridge
building, and flooring due to its durability and fire resistant
properties. Large portions of the remaining Black Butt trees are
contained in reserves and its plants are highly regarded as honey
The timber of this tree looks good, and has more of an even colour
than other species. Plantation Black Butt is a light yellow colour
and even-grained, while native regrowth Black Butt has much more
a large sized hardwood found only in the South West of Western
Australia. It is Western Australia’s principal tree in terms of both
the extent of forest and in the versatility of its timber. The bark
is rough, covering the whole trunk to the smallest branches and is
similar to that of the Stringybark.
heartwood varies from rich reds to deep browns, with sapwood being a
clearly distinguished pale yellow. The texture is course and
generally straight grained although some interlocked grain may
The heartwood is durable (Class 2), allowing
a wide range of applications. The material works well and has been
widely used in a variety of applications including flooring,
joinery, paneling, sleepers, poles and piles, heavy construction and
domestic structural framing.
known as the giant tree of Western Australia, with examples in
excess of 50 metres in height. It has quite rapid growth, and can
attain enormous dimensions.
It is found in the higher rainfall areas in
the South West of Western Australia, favouring light loamy soils of
good depth. The heartwood varies from rich reddish browns through to
pale pinks with the sapwood being a clearly distinguishable light
The texture is course and considerable interlocked grain may
be a feature. The heartwood is moderately durable (Class 3), with
some restriction on the timbers use in exposed structural
applications. The material is not easily worked, in part due to the
interlocking grain and high density.
It is used in a variety of
applications including flooring, joinery, paneling, veneer,
sleepers, shipbuilding, heavy construction and domestic structural
Wood from the
Marri tree is incredibly hard and durable. The wood itself
has a lustrous, golden glow and honey coloured hue with fascinating
grain patterns. The natural colours of
Marri exotic wood blanks are quite breathtaking and there is
no need to stain the lumber. This creamy coloured, exotic wood with
contrasting black gum veins and streaks has now become a highly
sought after and fashionable lumber.