As a general rule...No!

But it is up to you!

I wouldn't ,but as Teejay says,it is up to you..this is how they are supposed to be..no need to nip side shoots out..

interesting! I have just planted some tumblers in chimneypots and assumed I would have to nip out side shoots, so now I know!The more important question maybe is 'will there ever be a hot dry spell'?????

thank you all for your comments --great help