The australian tree fern makes an extraordinary sight33 long finely cut fronds of up to 15m 40541 unfurl from the crown in a truly magnificent display that adds drama to damp shaded areas of the garden native to australia dicksonia antarctica is hardy to around 455c 4023f41 and thrives in the relatively mild wet climate of the uk this slow growing rhs agm species forms only 3cm of trunk per year taking many years to reach its ultimate height of around 4m a truly ex