Moss Guild / Moss Garden

Are there any plants that will grow with moss, and not outcompete it?

Will any kinds of wood sorrel work? A wood sorrel already growing nearby is spreading through stems (rhizomes?), so it might be too aggressive.

Maybe ferns?

Wood sorrel sounds like a great companion along with some shade-loving plants like hostas (on the border) and blue-eyed grass. Maybe a few impatiens for a splash of color.

I would love to have a Moss Garden if moss would grow here though it is probably too hot and sunny.

I love moss and think this is a great idea! I bet spring ephemerals could be a good fit in such a guild since they only exist for a short time and usually want similar conditions to moss. I've seen Sweet Cicely (Osmorhiza claytonii) growing with moss in their understory. Since their habit is more upright, they allow space underneath. There's a guild in my yard of Cup Plant, Chickweed, Sweet Cicely and many others where moss grows in the understory. I didn't plant this guild, but it does amazingly well. Elderberry or similar could be a good possibility for a larger plant in the mix. Wild Ginger might work, though it can spread quite a bit and might be too aggressive, not sure. Looking forward to what ideas other folks might have! When I have the time, I might have to reread Gathering Moss by Robin Wall Kimmerer to see if that yields any ideas.