Best container mix for a Dicksonia antarctica?

[Kristen]

I doubt Mr Fox will bother to come under a fence, if the fence is only 6' - 8' he'll climb over it - to more likely take advantage of something near the fence to get a leg up. But, like I said, he usually needs a reason to bother to come into a garden, so if there is nothing there to interest him then he usually won't bother.

[fern Rob]

My garden unfortunately Is the only one around me with any wildlife as most other gardens are just paved over.