Hawaii tree fern root system
My mother has recently returned from a trip visiting our old home of Hawaii. One of the plants she brought with her was the base of a Cibotium chamissoi "Hawaii tree fern" (Hapu'u) for my 6 year old son. After gathering supplies to make a special "pot" for it, I realized that I knew little of this fern that once was nothing more to me than a weed I had to constantly fight for yard space.
On to the question at hand: Does the Hawaii tree fern have a deeper root system, or a wider one? Does it naturally ball up or spread out? And the main question, If I make a 2 1/2ft deep 4ft x 4ft wide box to keep it in, will it grow near to wild size?
Thank you much!