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Eucalypts As Bonsai: Extracted a Summary and in February 2020 Posted It to Ausbonsai

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Eucalypts As Bonsai: Extracted a Summary and in February 2020 Posted It to Ausbonsai Eucalypts as bonsai: extracted a summary and in February 2020 posted it to AusBonsai. a summary of what we know The following information comes largely from that Part 1 of 2. Introduction summary but is tailored to the Canberra climate, and draws heavily on posts by CBS members. Three I was surprised to find an active debate on key themes are: AusBonsai about whether eucalypts are worth the effort they take to train. • Bonsai artists strive to grow a tree in a pot that captures the essence of those in nature. This is Some posts suggest eucalypts are unsuitable for not easy with eucalypts, but some people have bonsai and/or not worth the trouble because of done it well. their (generally) large leaf size, their habit of dying • Some traditional bonsai techniques do not back as a result of trimming, their tendency to appear to suite the growing of eucalypts as resent having their roots pruned, difficulty with bonsai. ramification and the difficulty of producing a high- • This paper summarises current knowledge and quality bonsai design. Others point to the fact that sets a basis for bonsai growers in the Canberra there are many examples of beautiful eucalypt region to extend our knowledge. bonsai (see inset from Wirrabara on Peter H’s tree winning BCI’s 2020 Tree of the Year competition); Eucalypt wins BCI Tree of the Year 2020 and that while not all Australian natives will prove to be suitable for bonsai, unless we continue to On 1 June, Bonsai Clubs International experiment and learn we will not know which ones announced the winner of its 2020 Tree of the to avoid and which ones to use. Year Contest is Peter’s Eucalyptus nicholii. If the story of Peter’s magnificent Eucalyptus nicholii doesn’t convince you that eucalypts can be great bonsai material, surely the following information extracted from a brochure by the Australian National Botanical Gardens provides ample inspiration for bonsai artists to include eucalypts in their collection: “eucalypts are a defining feature of much of the Australian landscape and an essential part of Australian culture. They dominate the tree flora of Australia and provide habitat and food for many native animals. Of the over 850 eucalypt species known, almost all are native only to Australia. Some species have a wide geographic distribution; others are The tree is styled as a natural Eucalyptus, 90 cm extremely restricted in their natural habitat high, in a Pat Kennedy pot. and need conservation. The tree was found at a Canberra tip in 1995. It But not all eucalypts are Eucalyptus. The term was in very little soil and full of mealy bug and ‘eucalypt’ refers to three closely-related genera sooty mildew disease. Peter nurtured it to of the Myrtaceae family – Eucalyptus with 758 health and over the past 20 years has styled it species, Corymbia with 93 species and like the gum trees in his local area. Angophora with 10 species. Colloquially they are all called ‘gum trees’.” Over the years Peter has had to battle with dieback as it lost some of its original branches. Views posted to AusBonsai Doesn’t it embody the spirit of the countryside During the latter part of 2019, I trawled through the around us? Doesn’t it make your heart leap? 1,000-plus posts on AusBonsai on eucalypts, 10 The concerns expressed on AusBonsai about the Botanical name Common name suitability of eucalypts for bonsai are, nonetheless, E. botryoides Bangalay, or Southern real. They clearly come from experience. This mahogany points to the obvious reality that we have much to Botrys is Greek for learn about the training of eucalypts as bonsai. grape and botryoides means like a bunch of Species suitable for bonsai grapes. Photograph It is not known how many species of eucalypt are source shows fruit suitable for bonsai (posts on AusBonsai report over capsules. (b) 40 are being worked on) but there is a general view that it is best to grow species that are native to your E. bridgesiana Apple box local area, or at least grow in a climate similar to your own. The grey furrowed bark resembles that of The following list (in alphabetical order) records the apple tree. Plants species that are being grown as bonsai in Canberra. of South Eastern New Unless otherwise specified, the accompanying South Wales photographs come from: (a) the Australian National Botanical Gardens image library or (b) Trees of Stanford (Stanford University). The E. caesesia ssp caesia; Caesia Silver Princess (somewhat random) snippets come from a range of caesia ‘Silver Princess’ sources, as shown. Together they show some of the wonderous diversity of Australian eucalypts. Has a weeping habit and a silver, white powder substance that Botanical name Common name covers the branches. A. costata Smooth-barked apple Source: (a) E. cinerea Argyle apple On display at the It has rough, fibrous NBPCA. Photograph by bark; juvenile leaves Leigh Taafe are egg-shaped; white flowers. Source (a) and Wikipedia E. crebra Narrow-leaved C. nesophila syn. Melville Island ironbark E. nesophila bloodwood It has hard, rough "ironbark" from its Endemic to northern trunk to small Australia. It has rough, branches and linear to tessellated bark, lance-shaped adult lance-shaped or leaves. Source: curved adult leaves. Wikipedia Source: Wikipedia. 11 Botanical name Common name Botanical name Common name E. crenulata Buxton gum, silver E. melliodora Yellow box gum or Victorian Classified as rare silver gum Yellow box tends to because it is only flower in alternate known from two small years. The ‘yellow’ forest reserves near refers to the sapwood Buxton, northwest of colour and the ‘box’ to Melbourne, but is the non-peeling, finely widely cultivated. matted bark texture. Source (a) and Source (a) (b) Austplants.com.au E. nicholli Narrow-leaved peppermint E. gunnii Cider gum Peter H’s E. nicholli on In the Hobart Town display at the ANBG in Almanac for 1830 we 2005. Source (a) read that the name ‘cider-tree’ comes from its extruding of a quantity of “saccharine liquid E. orbifolia Round-leaved mallee resembling molasses.” A large shrub or small Source (a) (b) tree. The oval-shaped, E. kruseana Book-leaf mallee grey-green leaves are 25-40 mm long by It is one of three or so about 15-40 mm wide. eucalypts that retain Creamy white flowers juvenile foliage 20-25 mm diameter. indefinitely, and it is Source: ANSPA the only eucalypt with E. parvula Syn. Small-leaved gum petals. Source: (a) (b) E. parvifolia E. mannifera Brittle gum Has attractive, opposite, bluish Its main attraction is juvenile leaves 2½ cm its smooth white long. Adult leaves are trunk, often mottled narrow and 6 cm long. with patches of grey, Source: (a) (b) which changes to a pink colour in late E. pauciflora ssp Snow gum spring or summer. niphophila Source (a) It has smooth bark, glossy green elliptical leaves. Has smaller leaves than other subspecies of E. pauciflora. Source: Wikipedia 12 Botanical name Common name Botanical name Common name E. pauciflora ssp Snow gum white sallee E. scoparia Wallangarra white pauciflora gum or willow gum A small to medium- Medium upright tree sized tree restricted to with smooth white a few rocky mountains bark, branchlets waxy. near the border Trees in sub-alpine between NSW and areas have crooked Queensland but is lower branching widely cultivated. trunks. Source: (a) Source (a) Wikipedia Cardinia Shire (Vic) E. sideroxylon Red ironbark E. polyanthemos Red box Leaves are often Red Ironbark has very coloured blue by a fine hard wood that has wax that cold-climate been used for heavy eucalypts often construction and secrete for protection. railway sleepers. The Juvenile leaves almost foliage is dull, greyish- circular; mature green in colour. leaves are lanceolate. Source: (a) ANSPA Source: (a) (b) E. punctata Grey gum E. spathulata Swamp mallet Typically grows to a E. spathulata is a height of 35 m and mallet: a small-tree forms a lignotuber. It form of Eucalyptus has smooth grey, found in Western brown or cream- Australia. Unlike the coloured bark that is mallee, it is single- shed in patches. stemmed and lacks a Source: (a) Wikipedia. lignotuber. Source: (a) Wikipedia E. robusta Swamp mahogany E. stellulata Black sallee this tree has rough, A small tree or mallee fibrous bark, and endemic to higher leaves that are glossy altitude regions of SE above and paler Australia. It has rough below. Source: (a) (b) bark on the lower part E. rubida Candlebark of the trunk and smooth greenish bark It has smooth bark, above and lance- sometimes with rough shaped to elliptical bark at the base, leaves. Source: (a) lance-shaped adult Wikipedia leaves. Juvenile leaves more or less round. Source: (a) Wikipedia 13 Botanical name Common name E. viridis Green mallee It is not known if any (or all) of these techniques are suitable for all species of eucalypt. Note that one This plant can either experienced CBS grower says that, in his be a shrub or small experience, such techniques won’t work with ‘all’ tree (2 to 9m tall). It species, and in some cases, they will work with has a lignotuber with some individuals of a species but not others. one to many trunks. The leaves are narrow The different types of leaves are variously, and and about 12cm long. somewhat inconsistently, defined in the literature, Source (a) but all use descriptive words that reference the shape of the leaf (e.g. lanceolate: shaped like a lance tip; ovate; alternate; oblong; elliptical etc.). The following species are all mentioned on The following photographs show some of the AusBonsai and may or may not grow well in variation in eucalypt leaves.
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