HiWoody , no rules for this amatuer , never has been never will be , i tend to make my own

.I do what needs to be done when i feel in the mood ,i collect out of season if the material is AT RISK of being destroyed , however each method , time , material , and application is all noted then retried a second time . If it works "I RETRY IT " then i post it as personal experience , not read and posted as some do .I do this for my personal benefit and if you want follow guidelines that's good .Nothing ventured nothing gained , try to find info on Air-layering a Norway spruce , i cant , so i do it .Now is a good time as the new growth is hardening off so it has basically finished its growth cycle now it should have the strength to grow some roots ..or will it .
I have asked numerous questions on forums but nobody has given or been able to give positive proof as to a method that works better, not once but mutiple times . If i'm wrong i will tell you the layer failed if and when it does , if it works then i will try again , "same bat time same bat channel" then try a different method/time of the season .I spend more time experimenting on methods and researching , trying to find info on how too ,if its not available then thats the challenge .Air-layering of junipers , pines , cedars in fact the majority of junipers can take up to 2 years , some i dont bother because i cant get them to play ball . All info such as age of the subject , placement of the layer , mediums used , hormone treatment , all must be taken into consideration . young material may take a shorter period but i chose to do most of my work on older collected of purchased material .
I have had Japanese Maples take 2 seasons to take root ,and had failures , yet i have had good results in 3months using only different potting /bagging methods . Mate a question for you

,Is it summer Autunm or spring because i'm not quite sure as to which season we're in .Mother nature is a little confused as well .Anyway if you follow guidelines and rules then hopefully you will always get a good result , i simply apply my own as i cant seem to find info required to suit the species i'm working with . I kill a lot of trees pushing the limits in order to gain knowledge of what works and what doesn't .These methods may not work in your climate , differing facters : climate , temperature , humidity , rainfall ,even altitude , water quality many many things to consider .What works for The Old Fella in the west "Hi Pup" Wont work or work as well or as quick for me in the Alps , guarantee he doesn't get snow or black ice .Cheers Alpineart