I have read previous posts on this group about moss but they all seem
to be about removing it rather than encouraging it!

I have some low level (approx 600mm high) walls in may garden which
creats a look of too much brick work. It looks too new and
un-established.

I would like to grow some moss on the walls but i don't know where to
start.

Any advice anyone?
Someone suggested live yoghurt?

Regards,

Rich