Quite normal practice for me.
Just another day at the office.
Usually if I plant anything near civilisation; I do it at night. I fortunately have developed very good night vision. I never bring a torch with me, if I need to; I can use the light from my mobile phone to identify what something is, but more commonly I just hold it up and identify it by the invasively glaring lights of Dartmoor prison. What a waste of electricity. Whilst I am creating Oxygen; they're burning it up.
I love being out at night. The dark doesn't bother me at all. Most walks I go on are at night, and certainly most of my planting and sometimes collecting too. you see far more wild life and no people at all. Everyone who I have spoken to, when I have been out planting has been happy with what I'm doing, but I am concerned that one day someone might give me grief about it, so if it's next to any kind of human settlement, like this site is; then I basically feel much more comfortable doing it at night.
All along this road are stone walls, made of granite. Some of them are just holding up banks of soil, some of them are either filled with or topped with soil. On others, so much peat has built up over the decades or centuries from moss and other small plants, that now, there is enough to support some small rock loving plants, I would presume.