|Cyathea cooperi Tree Fern after being moved|
You can see how I dug down about 500mm for the rootball to be covered at ground level and then built up organic matter (cow manure and compost) around the base and trunk for stability and to keep the moisture in. This is very effective in giving transplanted tree ferns the damp but not moist conditions they thrive in, plus it saves having to build stakes around the plant for structural support.
I used about fifteen rocks to keep the base firm and to protect it from foraging chickens, as well as about eight bricks to stop erosion from watering. The rootball at 5 years is about the 500mm across, and I did chop it back a bit for shape with a spade to give the rootball as neat fit with the hole.
Using three 25L bags of cow manure and about 2 bags of compost means the plant has plenty of nutrient rich media to grow into as it settles into place. I imagine it will take 18 months to settle in completely and re establish the fronds to the previous length, which was about 3m long and about 15 fronds.