Hi there
I have many rose bushes here in my garden....56 and more coming and I will tell you about my very favorite and that is James Galway! Yes he grows tall...yes, you can train him to go on an arch! He is very nearly thornless and Iet him grow as tall as he wants and yes he will grow to 15 ft if left to his own way. Whenever it rains I wish I would have him on an arch but when we moved here there was ring of 5 James Galways and they pretty much support each other. I think you made a superb choice! This is one spectacular and easy care rose and I sure hope you love it as much as I do!