Sometimes, in my railroad of climate zone 9a (EDIT 3: Actually it was zone 7a, my bad), little patches of moss come and go. I found that by regularly weeding around and watering the moss (like, almost every day) I can very slowly encourage the moss to spread. I don’t have any good photos at the moment but I will be sure to post them here tomorrow.
I really like moss because it’s quite pretty essentially works as scale grass. I don’t know what type of moss I’m growing because I didn’t buy it from a plant store, it’s essentially just “wild” moss. Usually these don’t spread or last very long, hopefully it will with my intervention.
Side note, it seems that the moss that grows on hard-pressed dirt ground is shorter and arguably perfect scale grass, but weeding is interesting no hard pressed ground; the weeds are far smaller in size but very many in number, the first few weeks seemed fruitless since i just kept weeding and didn’t see the moss spread. Seems to have been worth it though, hopefully
I also read on some article that moss plants do go dormant during the winter, but in doing so they still remain green… sounds perfect for beautifying a garden railroad… though my progress is slow, I’d love to hear any thoughts or tips for growing moss 
Edit: yeah i forgot to get it today. Sorry! I’ll get it tomorrow.
Edit 2: Okay, I’m finally uploading pictures now. They don’t look the best in these photos; the moss is greener and more vibrant on some days than others.
Getting them to spread more is a work in progress.
