Eucalyptus regnans - Stringy Gum

Eucalyptus regnans - Stringy Gum


Why we like this species:

A tree of olympic proportions, one of the tallest flowering plants on earth and just great fun to grow in a pot or your garden until such time you cut it down for firewood! Call us on 0751 526 1511 for help in choosing your Eucalyptus.   


Botanical Name: Eucalyptus Regnans


Nursery notes:

Spring 2019

5 x 3 litre 60-80cm trees left

New stock anticipated ready for sale at the end of April/begninning of May 2019. 


Botanical Name: Eucalyptus regnans

Family: MYRTACEÆ; Myrtle

Common Name: Mountain Ash, Giant Gum, Victorian Ash, Australian Oak, Tasmanian Oak, White Mountain Ash, Stringy Gum, Swamp Gum (Southeast Australia)...quite a lot really! We stick with Swamp Gum.

Status: Evergreen Tree                  

Origin: SE Australis and Tasmania


Why we like this variety:

  • A species driven to be the biggest and the best
  • Fantastic specimen tree for parkland, arboretum or huge garden
  • Great fun plant for growing in a pot for a few years, if you don't have the space


Description, habit, uses and attributes:

The tallest (flowering plant) hardwood tree on the planet. Very tall tree thriving in moist forests and mountain slopes in cooler parts of southeast Australia. The largest one ever officially measured was 373' tall, rivalling the coast redwoods of the United States. It is one of the "half-barked ashes," meaning that the bark is persistent on the lower trunk and smooth above. However, in cultivation the bark may be light and smooth nearly to the base of the tree. In addition to being a novelty for its size, it is also a very attractive tree; but it must be given moist soil and a site sheltered from wind. It is also sometimes grown for timber



E. regnans does not have a lignotuber, so will not regenerate off the root crown if clear felled or cut down by machinery, frost or beast.  However, if pollarded to around 1m, epicormics buds may sprout from the trunk, provided the tree is not very old. Mature trees may not be able to re-sprout.


What is a lignotuber?  Link to lignotuber page


How to use in the landscape and/or garden:

Good Specimen Tree for the wider landscape, arboretum collection or avenue planting and for the small/medium/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.  

Growing shrub-onna-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)

See our ‘Help’ pages here - Link to help pages


Floral Art: 

E. regnans is not on our ‘Cut foliage’ list, but I see no reason why you could not use the odd branch in a vase of flowers


Firewood Production: 

E. regnans could be useful for Biomass or Firewood production due to it’s fast rate of growth. 


Hedge-Screens & Windbreaks: 

E. regnans is not on our selected species list for hedge-screens and windbreaks



- 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. Also, I have been told that the eucalyptol in the leaves deters flies


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



- Bees. All Eucalyptus produce flowers with nectar and pollen, providing foraging for honey-bees and other pollinating insects 




- Growing on the Coast 

We have no experience of growing E. regnans  in a coastal environment.  I suspect it may do well in milder coastal districts, when grown a mile or two inland of the sea, but this needs trialling.  Do get in touch if you are giving this a go and let us know how you get on.   

See ‘Help’ pages for further details on growing in coastal locations here: hyperlink to help page


- Drying up wet soils. 

E. regnans is very at home in moist soils in warmer climates. This is a great species to help you regain the use of boggy ground, dry up wet ground that intermittently floods, gain remedial treatment for winter boggy ground or which suffers from outflow from a Septic tank system or unwanted dew ponds. If you have un-usable marshy pasture, I suspect that planting a couple of swamp gums will help dry the ground up and give you a crop of firewood logs too, if coppiced every few years; certainly worth giving it a try.

E. regnans will not tolerate prolonged periods of frost or frozen ground. Not suitable for draining wet or boggy soils that will freeze in the winter and damage it’s roots.


- SUDS protocol.  Needs trialling, but planted singly or in groups, E. regnans  may draw on drain water percolating into swales or similar. 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.


Pot Culture outdoors:

 E. regnans could be grown 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.  If not watered enough, it becomes thin and spindly, dropping its lower leaves.            

Due to it’s fast growing nature, this tree will not be happy in a pot for a long time, but you may enjoy growing it for a few years before treating it as a crop for kindling or chicken bedding and starting a-fresh.

Do not be tempted to plant in the ground once it has outstayed it’s welcome in your pot.      

For information on how to grow Eucs in pots, see our ‘Help’ pages here: Link to help page



Shoots ‘n Leaves:

Young shoots glossy green sometimes with bronze bits

Juvenile foliage: large glossy lanceolate shaped leaves in deep leaf green

Adult foliageBark: the first 15m or so of the trunk is a rough bark with a crumbly surface of brown, grey or black; thereafter the trunk rises with smooth bark in cream, olive and seal grey, shedding in ribbons.


Bark: the first 15m or so of the trunk is a rough bark with a crumbly surface of brown, grey or black; thereafter the trunk rises with smooth bark in cream, olive and seal grey, shedding in ribbons.

Flowers: White flowers in groups of 9 to 15


Leaf Aroma: typical Eucalyptus combined with a sweet balsam aroma


Rate of Growth: fast, 2 to 3m per year in optimal conditions


Height in maturity:  under optimal conditions in the Tasmanian and Australian forests it can over time reach 90m, but probably won't reach that in the UK


Hardiness: generally surviving down to around -8°C, improving with age down to around -12°C We have been advised that our current source of seed is of exceptionally hardy provenance.

Hardiness in Eucalyptus is governed by provenance of seed, how it is grown (i.e. high nitrogen levels reduces cold tolerance), and the age of the tree - the older your tree, the hardier it will be. Younger Eucs are more susceptible to frost damage.


Planting Position and Soil Preference:

Full sun

As a native forest dweller it enjoys deep soil and a high annual rainfall.  Avoid growing on boggy ground and windy, exposed locations. We suggest you grow it in a pot for fun, like a long-term bedding plant. We have found that it responds to the Spring pruning of young shoots, so it could be managed for a few years. Ultimately destined for the barbecue, don't be tempted to plant it in the ground once it outgrows its patio pot as we guarantee that it will fall over if not continually grown in an air-pot.


To encourage deep rooting and therefore good stability, prepare a deep planting pit as per our instructions.  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.


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.


Meaning of the name: Eucalyptus regnans: Latin. Regnans; ruling, referring to the height and dominance of the trees.


Interesting Notes: the tallest flowering plant on the planet! Regnans as in Regina = Queen or Ruller.


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