As a very inexperienced gardener I'm after a bit of advice please. We have a newly built sleeper bed against an existing fence which needs planting. It is 10m long but only 40cm wide, gets a fair amount of sun throughout the day. I'd like some evergreen shrubs but a bit of colour for the summer, it is against the fence so some height would be good in some places too. I literally have no idea other than to fill it with lavender plants and hope for the best!