Bonsai Nut
Nuttier than your average Nut
I use Dip and Grow as a general use product for easier-to-root species. Out of the bottle it is 1.0% IBA and 0.5% NAA, and you dilute as appropriate. I have not tried it with fir cuttings, but it works well for me with Japanese maple and juniper.
Interestingly, when searching for hormone strength for fir cuttings, I found an article talking about getting fir leaves to root - ie the individual leaves versus an entire cutting. Here is a decent article about cuttings of Douglas Fir. It is interesting that they soaked their cuttings for 24 hours.
Interestingly, when searching for hormone strength for fir cuttings, I found an article talking about getting fir leaves to root - ie the individual leaves versus an entire cutting. Here is a decent article about cuttings of Douglas Fir. It is interesting that they soaked their cuttings for 24 hours.