air layering
 

I'm preparing to do some air layerings this summer ( for first time in my
life)!
I'll try to do 'em on few hornbeams and oaks and birches...so if someone
could tell me how long (aprox.) does it take for hornbeam to root when i'm
air layering it!???
same question stands for birch and oak...A L S O!
Thanks
Ivan - Croatia