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material world: eucalyptus

Eucalyptus is a diverse type of flowering tree within the myrtle family. There are over 700 species, most of which are native to Australia, and only about 9 can’t be found there.

Eucalyptus are favored as a fast-growing sustainable resource, similar to bamboo, and all of the tree—it’s wood, leaves, flowers—are broadly by: Umesh Behari Mathur

First, the flower blossoms provide nectar for insects, birds, bats, etc. and essential oils from its leaves contain natural disinfectants so it’s used in cleaning products, deodorants, toothpaste, decongestants and cough/cold medicines.

Its also a key food source for some koala and possum who are tolerant of those chemicals which can be toxic in large by: puuikibeach

On both a positive and negative note, eucalyptus trees require lots of water.

In swamp-like areas, planting them can reduce soil erosion and malaria bearing mosquitoes—ironic considering its inherent insect repellent properties—but in normal to dry or non-indigenous areas, they can prohibit other plants and native plants from thriving.

Such is the case in California where eucalyptus trees were introduced in the mid 1800s with the hopes that their fast growth would offer a vast supply of railroad ties as miles of new tracks were laid during the Gold Rush.

Unfortunately, wood from younger trees warped dramatically and wood from older trees was so dense that nails couldn’t easily secure them in place—both characteristics sealed its fate.

Although its favored as a windbreak and for curbing erosion, it’s disliked for its role in feeding forest fires (read on) and regenerating from mere trunks, so currently measures are being taken to reduce its population there.

Types of eucalyptus plants and trees have been carbon dated to tens of millions of years ago—around the time charcoal deposits have been dated as well—which is interesting since they share a common trait.

As a living plant, and at high temperatures, eucalyptus oil can be emitted as a vapor—which creates the characteristic blue haze of Australia’s landscape, shown above—but it can also be highly flammable, like charcoal.

But the wood becomes more dense—and therefore stronger, much like teak—so it’s also prized for its durability outdoors while those same natural oils help protect it from the elements.

Like most woods, eucalyptus weathers to a soft silvery grey but tung oil can be applied periodically to help preserve its original patina.

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