Posted: 03/05/2013 at 09:47
Whatever you do, don't plant 'mile-a-minute' vine, whose proper name escapes me for the moment, I'm afraid. It's pretty and tough, and a rampant climber which will be up shoving among and under and through your roof tiles before you can turn round. I had one that in two years was up three floors and climbing under the slates towards the chimneys. The hydrangea is a great cover with very pretty flower mops and attractive seed-heads in winter, and self-supporting, sticking itself onto your wall. Birds love nesting in it - in my garden, at least.
Instead of a pot or raised bed, you might consider lifting some of the concrete to dig out a wee bed in the ground; not for anything with big roots, though, which might damage the foundations.