We live in an apartment and don't actually have soil for a garden so in our little space we bought plants and put them in bigger plastic pots, then prop them up with polystyrene and cover with mulch. That way when you need to move then etc it's a lot easier.
@Bec, they look fantastic! I've thought about doing something similar on my balcony with some succulents.
I think succulent gardens are the best for balcony‘gardens’ !!! I love it and I am sure your collection will multiply 💚