Posted: 09/01/2016 at 11:43
Choosing the right plants involves knowing the aspect of your garden - which dictates how much sun it gets; the location - exposure to wind, rain, frosts etc; the kind of soil - loamy, clay, sandy, alkaline, acid; and the width and depth of your wall beds.
You also need to decide whether you want permanent plants or seasonal changes. either way, the soil of compost in the walls will need to be improved every season to maintain nutrients for healthy plants. You also need to think about how much time you have for pruning, dead-heading, weeding and general maintenance.
If you can supply all this info here we can help. Photos would be good too. Use the tree icon to load them.
Alternatively, google for a good plant nursery near you or an independent garden centre (chains don't always have trained staff) and take the info to them and ask for advice on plants. They'll be happy to advise.