Posted: 13/03/2016 at 09:26
Hi Peter - it's a tricky little plot but there will be a solution. The narrow borders will limit the scope, but you can have year round colour.
What height are the walls?
The shade means lavender won't be happy so I wouldn't try that, but Camellias and Hydrangeas will probably be fine. I'd position them where they're protected from the early morning sun, so the two farthest corners would be ideal. You could then have clematis on the wall in between them, underplanted with perennials (the Hellebores will be fine) to give a more formal look. There are plenty of plants which we cansuggest for a shady area.
If you prefer informal, you could use one Camellia as a main evergreen, with some of your other choices filling the rest of the borders. The deciduous ones can be underplanted with bulbs for spring. Repeat planting is a good idea to give a bit of unity to the area, but you'll have to choose carefully because of the size of the plot.
To make a real impact, make those borders wider, or make one big one in an arc across one side. That would give you more scope to plant.Otherwise you end up with a line of random shrubs which never looks very successful.