Thank Sue, I read a lot in these days about mycorrhizae and yes, it' difficult to know if they are already there and if they are beneficial or not. Some have great results, some not.
For daylilies this is the only thing I found:
http://www.arcadiandaylilies.c...
I read on an italian forum they are really adviced for roses. But if the roses should die the mychorrizae would die, so everytime they should be added when planting new plants.
As far as I can get it seems they "specialize" with the plant they find.
I thought adding some to my seedlings won't hurt. At worst, everything will be the same as now.
