British Columbia: Dicksonia antarctica Tree Fern care

Hi I was overcome by temptation and bought a 2m tall Australian Tree fern "Dicksonia Antarctica" at Garden Works. I have a 95% shade area the 5% is filtered by a tall pink Dogwood tree and a Cypress and only morning sun it is North facing so the sun is behind of above the house in high summer. "IF" some leaves grow very tall and reach the roof or above will sunshine to the tip of the leaves kill the entire plant. In the moment the leaves are all bound by a wire . Is it better to keep them close together it makes it look sort of richer but I think by letting them open naturally it would look much better 6stems in the moment. Will it make more in the summer?
The corner is walled to 1m80. We also have a green house but the temperature in winter are very close to 0-5C when it freezes outside. I did heat it electrically but with BC hydro its prohibitive and cost like 150$ more per month.
I REALLY would love to plant the fern in real soil in the ground. I was wondering IF I put sort of a pot with an open bottom then I could remove it before the winter but in the warmer times it can get the full power of the soil (or attempt to protect it properly).
BUT I am concerned I have tried the wrapping method with my Banana tree burlap (Mexican potato bags) rolled around a big chunk of dry leaves a plastic bag around and the chicken wire and still the cut off Banana trunk rotted away even in an elevated bed full south facing and I have to start them from scratch each spring. Another guy in my area just choppes them down half way does NOTHING in an east facing corner near his door and they just shoot up in spring in the center of the stem..

As per pic I have two forest ferns who do very well there in the same area..This is my 1st tree fern and I really don't like the original black soft plastic pot it came in. So is it better in a BIG pot ( I do have some say 24" across)
Welcoming all suggestions thank you so much. Vic

 

I had a small tree fern planted in-ground a couple of years ago - it was mixed with native lady ferns in a shady area but it did receive a couple of hours of direst sun per day and did just fine. The first winter it managed no problem and got even bigger. Unfortunately this past winter was too much for it and I lost it :(
I have since replaced it with a much larger plant but am not willing to lose this one so I planted it in a very large pot and it will be moved to shelter this coming winter.

I'm not an expert on these plants so I would recommend that you contact the PNWP&EPS (Pacific Northwest Palm & Exotic Plant Society here in Vancouver. There are several members that have over-winter Dicksonia done to an art - in fact at our winter meeting that is what the lecture was on.
http://www.hardypalm.com/mentor.php
Good luck.