Eucalyptus grandis, known as the rose gum, is a tall tree with a smooth pale trunk and a skirt of rough bark around the base extending up several metres. It occurs in wet sclerophyll forests from the Daintree to around Newcastle and favours coasts and lower slopes in areas of rich soil and high rainfall. Stands dominated by the Rose Gum are frequently found adjacent to rainforests. In Paluma the best examples can be found near the Taravale turnoff along the Hidden Valley Road. My family call this area the Valley of the Giants and it’s an apt name. There are also several lovely specimens along Benham’s Road from the dam spillway onward. The rose gum does not usually germinate or mature in established rainforest habitat, but it’s not unusual to come across one that is a remnant from a wet sclerophyll forest that has been encroached by rainforest during periods of high rainfall and low bushfire frequency. There is a huge but now half broken specimen like this on the way to Birthday Creek Falls1.
There is a lot of interest worldwide in “big trees” and lots of competition for bragging rights for various categories. More that one website dedicates itself to this obsession, including the National Register of Big Trees, which lists the biggest trees of each Australian species. The rose gum is one of the largest trees in Australia. It commonly exceeds 50m in height, and the current record for this species is 86m. It is currently considered to be the tallest species in Queensland with a tree in the Conondale National Park called Big Bob measured at 72m in height. By comparison, the tallest tree species in Australia is the mountain ash (Eucalyptus regnans) with an individual called Centurion (>100m) classed as the tallest tree in Australia and the tallest hardwood tree in the world.
Eucalyptus grandis is very fast growing under ideal conditions and can reach up to 7m in its first year. It is a popular plantation tree inside and outside Australia for its timber and pulp. Timber applications include general construction hard wood, flooring, furniture. The leaves of the rose gum are eaten by koalas, which can also be found occasionally around the Taravale/Mt Zero area.
Text and photos by Jamie Oliver
1 look for a clearing and locked gate on the left about halfway to Birthday Creek Falls and go down this old logging road for about 200m. The tree is on the left.
In Turkey Talk no 117 of August 2017 there is an article by former U of Q Botanist , Ms Gretchen Evans, about the vital role played by rainforest Potaroos in the propagation of Eucalyptus Grandis via the consumption of native rainforest truffles resulting in the spread of spores adjacent to existing E.Grandis trees. There is a symbiotic underground relationship between the tree and the truffles which is quite remarkable. Perhaps this article could be re- published on – line for all to enjoy?
Good idea Michael. Thanks for reminding me of this article. For any PDCA members wishing to browse old issues of Turkey Talk they can also be downloaded from our Members section where all past issues of Turkey Talk have been archived. You will need a password to access this area. The article Michael refers to is actually in Issue 113, August 2017.