Posted: 15/10/2016 at 20:53
Festuca is a true grass so john innes plus 50/50 grit or perlite and full sun.
the carex you have? Comans Bronze, unlike most carex, is a sun lover and needs good drainage. I never water mine at all. I would use a straight john innes.
the others need shade and john innes 2 or 3