Essex, United Kingdom

I have 3 petula silver birches close together in the corner of a South and West wall (shady as the sun goes down) and I would like something to plant underneath. Piracanthus grows close up the fence. My garden is neat and orderly. I have 2 ideas, either Box Balls or Pittsporeum Tom Thumb. I would love your thoughts on this, or any ideas or advise you can give please. Sorry not a good photo, the birches are in the corner.

• 10 Aug, 2019