Moss (or something else) to grow between slate.
 

We just layed out a 20x20ft. patch of slate on mortar ontop of concrete
in our city backyard, we put them 1/4 inch a part, (havn't grauted(sp)
yet) hoping we can grow some type of green in between. Do we mix
something in the graut? How do we go about it??? Thankful for all
respones.

Moss (or something else) to grow between slate.
 

Will do, thanks David, Lotta.