No special depth, but plant it in sun if you can.

thanks, Sheilabub...i want to put the shrubs in a 3-4ft high raised bed, and i have filled it half-way with crushed water bottles ..just want to make sure i put in enough soil....

You will probably find the soil is washed down among the crushed bottles though so it might be best to wait a while before planting it up and let it settle. There are many cinquefoils - are you talking about potentillas?