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Eucalyptus subcrenulata – Tasmanian Alpine Yellow Gum – 1 of our wonderful Swamp Gums

£36.00£370.00

Eucalyptus subcrenulata has a valuable, rare combination of desirable attributes

  • Evergreen tree that will grow in a wet clay soil and enjoy it!
  • Looks at home in the British rural aesthetic.  It doesn’t look foreign
  • Train as a small standard for screening
  • Superb in containers as a bushy shrub or lollipop tree
  • Fragrant foliage
  • Great for cutting – popular for bouquets, garlands, wreaths
  • Fast growing but also manageable

 

Sizes Quoted are the approximate height band of the tree above compost level, ie. the height of the tree once planted into the ground. Please note: Eucalyptus are living plants and can grow almost all year round, occasionally we may supply you with a plant that is slightly taller than your order. If this might cause you problems, please include a note with your order.

Click the dropdown below to view our different sizes & prices.

REF: EUCSUB00T
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Description

Eucalyptus subcrenulata – Tasmanian Alpine Yellow Gum – 1 of our wonderful Swamp Gums

Not your typical idea of a Eucalyptus, with its beautiful glossy apple green leaves, but it’s definitely one of our favourites. Eucalyptus subcrenulata is a good all round variety, which can be used in many different ways.

  • A medium sized tree of moderate to fast growth rate. It grows into an attractive specimen tree for open space.
  • Excellent cut foliage all year round, especially Christmas Wreaths or just in a vase of flowers
  • Brilliant for topiary as a lollipop or shrub-on-a-stick
  • Great for soaking up water from wet clay soils in winter
  • Great specimen for a container. For more information on how to grow in a pot see our Guidance Notes here
  • Firewood and Biomass

For more information on the attributes of Eucalyptus subcrenulata hop over to the tab labelled ‘How to Use’

BIOMETRICS

Shoots ‘n Leaves: Young shoots are crimson, bronze, then green.

Juvenile Foliage: Glossy deep apple green with red edges, deepening to dark apple green with time; the leaves are opposite, on square stems.

Adult foliage: Elongated, pendulous and a deep apple green.

Bark: Beautiful bark with ‘scroll-work’ type pattern. Peels in coffee coloured vertical strips.  When the bark sheds in July,  a golden liquid amber coloured under-bark is revealed before turning olive green/coffee again.  Looks very artistic after rain.

Flowers: White through to cream, in groups of 3. Our trees flower August onwards well into October – great for autumn foraging honey bees.

Leaf Aroma: Warm, strong and deliciously spicy when crushed.

Rate of Growth: E subcrenulata may take an extra year or so to get its ‘feet under the table’, but once established it can be quite fast growing. Medium to Fast at 1-1.5 m per year.

Height in maturity, if left unpruned:   after about 15-20 years, E subcrenulata could reach approximately 15 – 20m, although some specimens can attain a greater height under optimal conditions. Easy to keep smaller by regular pruning – March 18th and end of May.

If pruned, it can be trained to form a bushy screening tree, a lollipop standard or a multi-stemmed bush like a species rose or coppiced Hazel tree.  Responds well to coppicing and pollarding, when done at the right time of year. For more information on the best way to prune read our Guidance Notes here

Unless you are growing for cut foliage, please refrain from voluntarily electing to prune your Eucalyptus from August through to February; it can kill it.     To receive monthly pruning and aftercare advice, sign up to our Gumnut Club – its free and you can unsubscribe at any time.  To subscribe – just call or ping us an email to [email protected]

Hardiness: Good hardiness rating, root-system should be happy down to around -14 to -16°C, once mature. Hardiness increases with age.

Additional information

Weight 4 kg
Dimensions 150 × 40 × 40 cm
Size

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Planting Position and Soil

Eucalyptus subcrenulata – Tasmanian Alpine Yellow Gum

Under Planting and Soil:

Requirements:

  • Sun: Enjoys full sun and open sky above. Avoid shade cast by other tall trees and buildings.
  • Soil type: Happy in a wide range of soils, but performs best on those which are acid to neutral and of average to good fertility.
  • Soil moisture levels: Happy on any moisture retentive soil and tolerates intermittently poorly drained soil; grows well on our horrible yellow swampy wet clay soil at Grafton Nursery.  E. subcrenulata is good at drying up wet ground, making it more usable.  This species may become stressed on very free-draining or dry soils, particularly in a drought year.
  • Environment: Good in exposed locations, once established

 

Recommendations:

  • If planting a large number for firewood or cut foliage, subsoiling may be a good practice to follow, especially if pastureland has previously been used by livestock.
  • For the best results, follow our planting and aftercare watering instructions, issued with every order; they can also be found under the Help and Advice tab on this website.
  • Improve poor soils with our planting kit, at the time of planting.
  • To encourage deep rooting and therefore good stability, prepare a deep planting pit as per our instructions.
  • Ensure there is no competition from weeds or grass around the base of the young tree as this will seriously cramp its style and slow down establishment. Our research has found that grass around the trunks of newly planted Eucalypts can completely stop them from growing and may lead to failure
  • Make life easier for you and your new tree: Plant with the mycorrhizal fungi product Rootgrow.  Eucalyptus in particular have a special, lifelong relationship with their root fungi, the latter of which actively transport food and water directly into the tree roots, helping your new Euc establish faster and more efficiently, particularly in challenging types of soil.

How to Use

Eucalyptus subcrenulata – Tasmanian Alpine Yellow Gum

How to use in the landscape and/or garden:  How to grow or train it to get the best out of it

Fabulous Specimen Tree for the wider landscape, arboretum collection or avenue planting and for the smaller, medium and larger garden:

Growing a full-sized standard: planting the tree and running away is an option, but it won’t necessarily give you the best results.  We suggest you maintain a leading shoot and tip prune the lateral shoots to encourage bushiness.  Keep all the sides shoots as they are building up the strength of the main trunk.

  • To grow a large specimen, leave the tree to grow up naturally thereafter.
  • For a small tree, tip prune the leader when it reaches 1.2m, thereafter let the head develop. Then prune the tree every March 18th and end of May to keep your tree small and bushy.

For more, see our guidance notes for growing specimen Eucalyptus in our Help and Advice section.

For monthly emails on how and when to prune and care for your Eucalyptus, sign up to our Gumnut Club and we’ll send you the Bush Telegraph – it’s totally free and you can unsubscribe at any time.

Growing ‘shrub-on-a-stick’ clipped standard: this is an opportunity to grow a Eucalyptus in a confined space and control its overall size. You can produce a small tree on a trunk with a height of anywhere between 2.4m (8ft) and 4m (12ft).  Prune back growth every March 18th or thereabouts and tip prune the annual growth back by up to 90% at the end of May. Light tip pruning can be done again during July, but no later. Don’t prune from August through to February.

Growing a multi-stemmed bush or tree.  E subcrenulata responds well to coppicing, once it has attained a trunk of some 125 mm in diameter and readily produces a multi-stemmed specimen

Why would you want to do this?

To create:

  • a tree with more body or ‘mass’ of branches and foliage for screening purposes. Once grown back up to its full potential, it will now have several main trunks
  • an attractive multi-stemmed architectural tree, especially if it has exceptional bark
  • to control height, whereby your Euc can be usefully maintained anywhere between 2.4m (8ft) and 7m (20ft), but genetically it will want to grow taller if ignored.

REMEMBER: No grass, no weeds and a thick boring bark chip mulch, to a depth of 150 mm (6 inches) are essential to assist with good establishment. Our research trials have demonstrated that grass around the trunk of Eucalyptus prevent the trees from quickly establishing and can completely stop them from growing.

Pot Culture outdoors:  E. subcrenulata can be successfully grown as a multi-stemmed shrub in a container provided you are prepared to pot on at the recommended intervals and to supply it with sufficient water and food during the growing season.

Always keep pot grown Eucalyptus in the air-pot container system for healthy and happy trees.

For information on how to successfully grow Eucs in pots, visit our Blog entitled ‘How to grow a Eucalyptus in a pot and keep it alive!’

Hedge-Screens & Windbreaks:  E subcrenulata  is an excellent choice for a hedge-screen as it readily produces sub-lateral shoots and retains its lower branches for much longer than other Eucs. – i.e. keeps the branches sprouting off the side-branches and finds no problem in becoming bushy.  This is unusual for most Eucs and makes E subcrenulata  a great subject for a bushy billowy hedge screen.

Always prune your hedge-screen March 18th and maintain a profile like a capital ‘A’.  That is broad bottom, narrow shoulders and a flat head.  This allows light to all parts of the hedge and keeps it bushy.  If you let your hedge develop into the shape of a capital ‘V’, its bottom will open up…not a great look!

 

Floral Art:  E subcrenulata produces excellent cut foliage for Flower Farmers and floral art. Very useful where fragrant, green foliage is required. Very popular for Christmas wreaths and garlands.

 

Firewood Production:  E subcrenulata is great for growing biomass and firewood logs, especially on wet clay soils.

Do give us a call on our nursery mobile 07307 413 052 if you would like to discuss growing firewood with one of our consultants

 

Rural/Agricultural:

– Good shade tree for livestock to stand under.   Eucalyptus provide a cool environment for horses, cattle, llamas, sheep to shelter from the sun on hot days, as the mass evaporation of water through the leaves creates a cool shady canopy beneath. Good choice for silvopasture.

– Green foliaged species, which looks for comfortable and not ‘foreign’ in a rural setting – reminiscent of Willow Trees

 

Ecology:

– Bees. All Eucalyptus produce flowers with nectar and pollen, but this species has prolific flowers making it a real draw for honey bees and other pollinators in late summer when forage is scarce

– Habitat creation and Game Cover:  this species lends itself to providing good trouble-free habitat creation for wildlife and game cover, when planted in groups. At the nursery, the Goldfinches enjoys nesting in our subcrenulata hedge.

Birds enjoy roosting in Eucalyptus trees and Pheasants like rootling around underneath them.

– Chickens: The shredded foliage of E subcrenulata  is excellent at keeping Chicken nest boxes and hen houses free of red mites, which detest the presence of Eucalyptol. I used to line our Chicken boxes with shredded leaves, strew the floor and pile up the spindly branches for the chickens to make nests.  It was all great till the foxes moved into the next field L

 

Environmental:

Growing on the Coast:  E subcrenulata is tolerant of cold exposed conditions and salt laden winds, once mature in the ground. Newly planted trees may require a wind break shelter using something like horticultural fleece or sail cloth, for their first winter in the ground with you.

There is a successful plantation of E subcrenulata in sight of the sea at Wadebridge in Cornwall

Drying up intermittently wet soils. Hailing from damp hillsides in Tasmania and soggy valley bottoms in the wild, E subcrenulata does prefer a moisture retentive soil and does well at drying up a wet UK soil.

Dry up wet ground that intermittently floods, gain remedial treatment for winter boggy ground or soil which suffers from unwanted ponding.  If you have un-usable winter-marshy pasture,  our research has shown that installing a small plantation of swamp gums will help dry up an area of ground over a period of time and give you a crop of firewood logs too, if coppiced every few years; certainly worth giving it a try.  Just bear in mind that these trees are not ‘aquatic’ and will do best if the ground drains somewhat for part of the year.  Furthermore, coppicing would need to occur in rotation, so that you didn’t lose all of the trees and therefore the pumping of water in one go.

– Sustainable Drainage Systems aka SUDS: an 18m row of E. subcrenulata has been successfully used at one end of our nursery to absorb the overflow water from our irrigation system.  Planted at 1.5m spacing, around 2014, the trees are pollarded down to around 2m every 2-3 years and allowed to grow up to around  6m (15-20 feet) in between. The water used to pond around their ankles every winter, but the ground around them is now dry and passable even after prolonged, heavy rain.  They have retained their foliage down to almost ground level and now form a robust hedge screen for the nursery.

E. subcrenulata will draw on drain water percolating into swales or similar. Coppice or pollard every few years if you need to control the overall height of the trees. Eucalyptus draw on ground water for twelve months of the year, unlike willows, which lie dormant for 5 months through the winter.

– Tolerant of cold and exposed growing environments inland: E. subcrenulata will grow in open fields and pasture, once established.  Newly planted trees may require a wind break shelter made from horticultural fleece or sail cloth, for their first winter in the ground with you; this very much depends on the level of exposure.

For quick and efficient establishment, follow our detailed planting instructions.

No grass, no weeds and a thick bark chip mulch, to a depth of 150 mm (6 inches) are essential to assist with good establishment.

 

Nursery Notes and Trivia

Winter 2022 into Spring 2023

Stock levels: Due to the popularity and versatility of this species, we grow E subcrenulata in a wide range of forms and pot sizes.

For the first quarter of 2023 we have bush, feathered standard and standards available in 3L, 5L, 9L 12L, 20L, 30L and also mature stock of 100 litre multistems

Botanical Name: Eucalyptus subcrenulata

Common Name: Alpine Yellow Gum, Tasmanian Alpine Yellow Gum (Tasmania)

Status: Evergreen Tree    MYRTACEÆ; Myrtle Family

Origin: A native species found only on high plateaux and mountains of Tasmania, mostly in the central part of the island and Mt. Field.  E subcrenulata is one of the Yellow Gums and closely related to E. johnstonii and E. vernicosa.

Meaning of the name:  sadly rather unexciting – Eucalyptus subcrenulata: Latin sub-, sub and crenulatus, crenulate,   referring to the leaf edges.  source Euclid

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