Drooping Sheoaks - connecting with nature one plant at a time

Dense communities of Drooping Sheoak in Teesdale Grassy Woodlands Reserve today

The phoenix rises from the ashes

It’s May 2016 and the end of a long dry summer. I’m enjoying the view over a native grassland that was already showing tinges of green after our first decent rainfall in fourteen months. It was as if overnight the rain had washed away the layers of sun-bleached dust that had hidden their vibrant green. Beyond the grassland was the soft whispering edge of a woodland of Drooping Sheoaks, Allocasuarina verticillata.

This woodland in Teesdale was described in 1853 by the Surveyor General A.J.Skene as ‘thickly wooded with sheoaks”. So you would be excused for thinking that not much had changed in 170 years.  

The confronting truth is that every Drooping Sheoak along with the gums and wattles were cleared from this reserve after settlement. There was a need for building materials and fire wood so the sheoaks, eucalypts and larger acacias were in demand. Even as recently as the early 1980’s, aerial photos show the reserve had very few trees.

Two Council conducted cool burns in the 1980's and drought years of the 1990’s provided the perfect environment for a dry climate specialist like the Drooping Sheoak. An aerial photo taken at the end of this decade clearly shows clumps re-emerging.

Today the recovery is complete and the Teesdale Grassy Woodlands Reserve is at least as thickly wooded as it was in 1853.

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The hair-like branchlets of the Drooping Sheoak or 'Ngarri'

Commonly pronounced   -  Allo*cas*u*rina   vertic*u*lata.

The Wathaurong call the Drooping Sheoak ‘Ngarri’, which means hair tree. This beautifully describes the most recognisable feature of the tree which is its hair like foliage.
 
Carolus Linnaeus, the father of taxonomy, was thinking along similar lines when he named the genus casuarina after the drooping feathers of the cassowary. He adapted the Malay word for a cassowary which is kasuari. More recently the Drooping Sheoak was reclassified and its botanical name changed from Casuarina to Allocasuarina.  The Greek word 'Allos' - means 'different to'.

'verticillata' - refers to the vertical position of the scales (tiny leaves) on the weeping branchlets
 

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The beautiful rich red of Drooping Sheoak heartwood

Getting to know Drooping Sheoaks

A hardy small rounded tree to 7m that copes very well with dry and exposed sites. They have proven to be very adaptable to different soil types, as long as they are well drained. I have seen Drooping Sheoaks thriving on both heavy clay soils and well drained sandy loams. It's ability to fix atmospheric nitrogen also enables it to do very well on 'hungry' sandy soils.

Note: For revegetation work it’s always recommended to match soil types. That is, choose plants grown from a provenance that has a similar soil type to the planting site. These plants are more likely to thrive.

When they mature, branching usually starts at around 2m making them a useful small tree providing dappled shade for large gardens or a small paddock tree for the back paddock. Sheep also browse on the weeping ‘branchlets’ which provide useful drought fodder. 

It's hard dense timber is a deep red. When quarter sawn, distinct medullary rays crossing the growth rings are a beautiful and unique feature. A popular craft wood that polishes well, for turning, for wood art like sculptures and for furniture. 

Drooping Sheoaks are often seen as dense stands of trees on roadsides and in reserves. This is because they tend to dominate an area when they become established. Their dropped branchlets create a soft, thick carpet that prevents other tree seedlings from pushing through, though this takes decades to occur.

This was the case at the Ocean Grove Nature Reserve where after a long absence of fire, both the Drooping and the Black Sheoak (A. littoralis - commonly pronounced lit*or*a*lis. This name means coastal and indicates that it's found mostly along the east coast of Australia) dominated at the expense of the local eucalypt species and the other understorey and shrub species. Recent cool burns have allowed a diversity of other plant species to re-establish.

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Boomerangs made from the roots of the Drooping Sheoak. Photo Neville Bonney

Traditional Owners

Historic records suggest that Drooping Sheoaks were a prominent tree throughout the southern part of Australia before white settlement. This is because they were cultivated for their many values by the Traditional Owners.

The timeless whispering of a soft breeze through their foliage adds a mysterious dimension to the tree. The Wathaurong word for this whispering sound is whit:ge:wherri, pronounced ‘witjweri’. To them this was the sound of their ancestor’s voices speaking to them - see the Dahl'wah story below.

The Wathaurong soaked the cones of casuarinas in their drinking water to give it a lemon flavour and to add vitamin C. At times when water was scarce, they chewed the needle-like stems. This made their saliva flow and decreased the need to drink on long walks.

Some sheoaks develop hollows in their trunks which trap water. To have a drink the Wathaurong would find a hollow tube to use as a straw or soak the water up with a ball of crushed grass.

Drooping Sheoak wood is hard and ideal for making implements like spears, spear throwers, clubs, shields, digging sticks and clapping sticks. Returning boomerangs were carved from the roots, using the natural bends to advantage.

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Frances Bodkin

How Sheoaks came to be -  a Dahl’wah story

As told by Frances Bodkin, a D’harawal woman from Sydney. Aunty Fran is also a keeper and teacher of traditional Aboriginal knowledge and a western trained scientist with degrees in environmental science, geomorphology and climatology

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"Long ago men took responsibility for making string for hunting and fishing nets. They did this using plant fibres, twisted together by rubbing on their thighs. It was a difficult task, too difficult for women they claimed. But men were impatient, and felt they needed to do more important things like hunting and fishing. And besides, rubbing the fibres on their hairy legs was painful.

So they decided to instruct the women they should make the string. It’s not as difficult a job as we thought, they said. You can do it. The women started making the string, rolling the fibres on their thighs, then burst into laughter when they realised the real reason the men did not want to make the string. With less hairy legs than the men any hairs were easily removed by rubbing the leaf of the sandpaper fig on their thighs.

Meanwhile the men, pleased with themselves, were listening from behind the trees expecting to hear cries of pain from the women. But all they heard was laughter and chatter. Puzzled, they wandered off to do men things.

The string making duty stayed with the women who loved sitting in a circle chatting, sharing news. As they worked pieces of fibre fell to the ground, making a soft mat to sit or sleep on. When the old women died the Creator Spirit turned them into tall, straight trees, with leaves that looked like pieces of string. If you sit under these trees, the Dahl’wah, and listen carefully you can sometimes hear the chatter of the old women who keep the place safe

Note from Frances Bodkin : Sheoaks don’t drop branches haphazardly like many Eucalypts so you can camp there any time. You don’t get snakes under Sheoaks. The leaf scales on the branchlets get under the scales on the belly of a snake. So they stay away making it a safe place"

A male Drooping Sheoak flowering on the main road into Portarlington. Photo taken in late March.

Nature notes

This may be the first month of autumn, but for Drooping Sheoaks it could be ‘spring’. As you drive past a group of these trees you may notice many are turning yellow on their weeping tips. These are the male tree’s catkin flowers and they’re about to cast their pollen to the four winds.

Using this shot-gun approach, male trees have to produce large amounts of pollen to chance on a female flower. And the competition for the males is pretty fierce. On my reckoning, there are usually about ten male trees for every one female. These aren’t good odds if you’re a male, keen for your DNA to be passed on to the next generation. Studies have shown that male pollen can amazingly travel up to 1km to pollinate a female flower.

The female trees are very easy to spot as they are the sheoaks with cones. Starting as very small red flowers in autumn, they become shiny bronze cones after twelve months. The Drooping Sheoak has the largest cones of the sheoak family, some reaching the size of a bantam’s egg or a small Easter egg (Happy Easter!! and well done for getting this far).

The seeds in the cones are relished by corellas and cockatoos. They are also an important food source for the endangered glossy black-cockatoo on Kangaroo Island. Small birds are often seen foraging for insects amongst the dense sheoak foliage.

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Mature cones on a female Drooping Sheoak

An unexpected evolution

Puzzlingly, sheoaks were one of the new kids on the block in the Palaeocene, some 50 million years ago, but they were the luddites of the plant world. They mysteriously evolved using wind to pollinate their flowers, a method that was fast becoming old-fashioned. At that time most new plants were developing showy flowers to attract pollinating insects. This was a bit like the World Wide Web in plant evolution. This new flowering system tricked insects into doing all the hard pollination work for flowering plants, conveniently spreading their DNA over much greater distances.

Though being old fashioned has worked well for the sheoaks because over the next 50 million years the original wet-climate sheoaks adapted very well to a drying Australia, so that today they are the dry-climate specialists, often found in hot and arid places.

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Mature winged seeds from the Drooping Sheoak

Seed collection and propagation

If you’re planning to collect the shiny cones for seed, they're not ready. I fell into this ‘trap’ on an early seed collecting expeditions and found the seed from these cones was pale and immature. The cones need to spend a few more months ripening on the tree until they finally turn a weathered grey. Yes, the grey colour of those outside lining boards that needed to get a coat of oil last spring.

These weathered cones will open when placed in a paper bag and the dark brown winged seeds will fall to the bottom. Now they’re ready to sow into a seedling tray or direct seed into the back paddock next spring. No seed treatment is needed.

If you’re concerned about the genetic diversity of your future sheoak plantation, collect cones from at least ten trees. Also collect from around the perimeter of each tree to allow for pollen blowing in from different directions. The male sheoaks will be so grateful you made this extra effort.

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Next time you’re driving past some Drooping Sheoaks on the roadside, I hope you’ll notice their graceful beauty and think about their remarkable history.

If some are showing signs of yellowing at the tips don’t be concerned, it’s just the males getting ready to spread some cheer around. Hopefully there is a fair wind blowing to carry their pollen to the nearest female trees.  This is an age old process that has been happening in Australia for millions of years and should continue for countless years to come if we appreciate and look after this remarkable and resilient local tree.

To read more about Aboriginal culture and the Drooping Sheoak click below to read;
'The vegetation of the Barrabool Hills part 4 - Drooping Sheoaks adorned the hills in 1835'

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