Buxus Plants On Shallow Brick Work. Is This Appropriate?

Question

A couple of years ago I moved into my house. The former owners had made a feature of 4x 20cm tall buxus ball hedges outside the front of the house. They are planted on top of a brick structure, with only around 5cm of soil. Last summer during a very hot week, the plants got fried! I am keen to replace them (as they looked like a lovely feature) but wonder if they are really suitable for the task? ie planting in shallow soil. Any tip/advice/thoughts would be appreciated.

Answer 1

No, that is too shallow. It's not surprising the plants fried. Is it possible to add soil to this feature? I'm having a little trouble picturing it exactly. If not, I would use a non-plant feature on the structure. Maybe a small water feature.