The hardiest tree fern, in ideal conditions can grow over 10m! Winter protection is recommended in all but the mildest part of the country. It prefers more shelter and shade than Cyathea and especially should be protected from cold winds in the winter. Generally the more mature the fern is the hardier it becomes. Therefore a young plug plant must be grown under cover, especially when frost is forecast. They should also be protected from excess heat in summer and not alowwed to dry out.
The image shows a mature specimen at Fota House gardens.
Dicksonia antarctica - Smooth Tree Fern Plug plant €3.95