I think you could grow them in pots successfully for several years providing you are prepared to pot them on into larger size pots on a regular bassis, as they will otherwise soon become potbound, with the roots going around and around in the pots looking for a route out. I wuld sggest large black plastic pots and keep a close watch on the roots, comming through the holes in the bottom or even busting through the sides. Keeping it trimmed to your desired height (minimum 8ft) will also help keep the roots under control too. A slow release fertilizer given every 6 months should suffice and remember that the compost you use probably already contains nutrients that should last for 6 weeks at least. Good Luck.