Can I plant several Roses in one container?

I've got half a dozen or so Roses in containers which I want to free up. Some of them will go in the borders but I am thinking about moving two or three into one large container (70cm wide and the same(ish) height).

I like the 'mass planting' effect this would give me.

Obviously I'd need to root prune more often and ensure they are properly fertilized, but is there any reason why I can't plant them together?

Many thanks

 

Following on from Woo's advice......

70cm that's about 27 inches I think in my language. Unless they are patio or miniature roses then I would say no. Most shrub roses usually have a spread of at least 3ft, I can't see how you will get more than one in a pot this size Merleworld.

 

I have three roses planted side by side in a wooden crate. I'd say it's about 120cm in length though, so larger than the one you're proposing. With hindsight, I would have just planted two side by side, I may have to move the third. If I had thought to photograph them while they were in flower, I'd post a picture, but they're not quite so interesting now that they're not flowering. The two more established plants are doing nicely, and I don't mind that they sort of cross-over. They do require quite a bit of maintenance with this set up (I have to train them), but I only have a small container garden, so I don't mind doing it this way.