You may have to prune it to keep it in bounds. In Springfield, IL there was one plant at a restaurant/bakery called Incredibly Delicious that was about 8 ft tall but the branches spread about 15 ft wide. It has been about 8 years since I was there last so not certain if it is still there. The bakery was planning on redoing the surrounding gardens. Some years until it is established you may find that stems suffer freeze damage but that will help keep it in bounds.

Thanks Maifleur! That is very helpful!