Planting in a very formal courtyard bed
Planting ideas welcome.
I have a 4m x 4m stone built raised bed in a very formal courtyard of block paving, lawns and box hedging. It has a central plinth and sundial. At the moment it simply has gravel. I am thinking about planting the bed to give some cross seasonal colour and a bit of height, either by or by putting some large tubs/pots in the bed or by choosing shrubs for the bed. Any suggestions?
It has to be in keeping with a very formal garden and not need too much tending although we have an automatic watering system.