Abit of background..I have a gas pipe going up my outside wall to a
flue. the outside wall that its facing just has the drive, NO SOIL.

I'd like to try and hide the pipe so whatever plant we use will need
to live in a pot.

The flue is about 15 feet up and I've been told that it needs to stay
clear to allow the vapours from the boiler to escape. So the plant
should only grow to 15 ft ist...

Has anyone got any recommendations. Its quite a wide drive so I should
be able to use a big pot.

how about some kind of small tree which will not cling, just grow up, so
will not cover the flue (e.g. one of those really thin conifers)?
Hayley