MasterFR

I would recommend using a slab. It can be shaped and height set just like a wall, and has terrain related settings (e.g. bottom is 12" below terrain). It can also be shaped to create straight/angled/curved walls as needed. Then choose a material (i.e. make it look like retaining blocks, bricks, rocks, wood, etc). That is how I do it, works great, especially if terrain is still being adjusted/changed, though you also have the option to lock the height/position in relation to the building (ignoring the terrain) too. That way it works for both raised beds connected to the building, and raised beds that are independent and away from the building.