I have decided that I would like to make my backyard more bird friendly and try to attract some of the more rare types of birds that don't eat seed. I have purchased a Serviceberry bush (which I have read the birds love). It is called 'Regent Saskatoon' and is a more compact type at 4-6 feet. The only place I have to put it is in front of a row of very mature Arborvitae, and their numerous, shallow roots make it very difficult to dig a hole. I am also worried that the Serviceberry would not establish well having to compete with the Arborvitae for water. I am wondering if I might be able to plant this in a large pot and have it thrive? If so, how big of a pot, and what kind of soil would you recommend I plant it in?