- Mature height
- 3m to 6m
- Mature width
- 3m to 4m
Dicksonia antarctica unfurls a crown of large soft feathery fronds above a thick fibrous trunk, creating a rainforest atmosphere in a shaded garden faster than any other plant. A single established Soft Tree Fern reads as a mature landscape feature the day it goes in.
Dicksonia antarctica reaches 3 to 6 metres tall with a frond spread of 3 to 4 metres, growing very slowly at 10 to 30 centimetres of trunk per year. That slow rate is why advanced specimens carry the value they do, and it means a planted fernery holds its scale and proportion for decades.
This Australian native needs part to full shade, consistent moisture and protection from hot dry wind, which scorches the fronds. It is frost sensitive, so in cold districts choose a sheltered position. Water the trunk as well as the soil, since the trunk itself absorbs moisture.
Frequently Asked Questions
About Dicksonia antarctica
How tall does Dicksonia antarctica grow?
The Soft Tree Fern reaches 3 to 6 metres of trunk height with a frond spread of 3 to 4 metres, though most garden specimens sit well below that for many years.
How fast does a Soft Tree Fern grow?
Very slowly, at 10 to 30 centimetres of trunk per year. This is why advanced specimens with established trunks are valued and priced accordingly.
Does Dicksonia antarctica need shade?
Yes. It requires part to full shade and protection from hot dry wind. Direct afternoon sun scorches the fronds and can kill the growing crown.
How do I water a tree fern?
Water the trunk as well as the surrounding soil. The fibrous trunk absorbs moisture directly, and keeping it damp through summer is essential to keeping the crown healthy.
Is Dicksonia antarctica frost tolerant?
No. It is frost sensitive and the fronds are damaged by frost. In cold districts plant it in a sheltered position under canopy, which also provides the shade it needs.
Is the Soft Tree Fern an Australian native?
Yes. It is native to the cool wet forests of south-eastern Australia and Tasmania, and is protected in the wild, so nursery-grown stock should always be used.
Can Dicksonia antarctica be grown in a pot?
Yes, in a large pot with rich free-draining mix in a shaded position. Potted specimens need more frequent watering, including of the trunk, than those in the ground.