What plants would you suggest I use to conceal the concrete box in the foreground of the attached photo? I have planted Cotoneaster horizontalis around the box to the background. The surrounding lawn has Maples, Silver Birch and Mountain Ash. This lawn gets morning and full afternoon sun. Your expert advise would be greatly appreciated.
Shrubs can be planted near the tank but not near the percolation area because roots can block the percolation drains.
The kind of shrubs to use does not matter. Choose the shrubs you like but some easy ones are potentilla, hypericum, hydrangea, fuchsia and eleagnus.
You can also plant shrubs and trees back a bit from the tank to block the view and eventually it will be obscured.