I didn't even realize that they have been four weeks already. I haven't look at them as thoroughly since I think it is still a bit too soon. Will check it out later as the top grown has definitely exploded. The crabapple is still pushing leaves though but it throw roots much faster based on previous airlayers. We will see...
Five weeks in.
Wow congrats
It does take longer than Japanese maple from my experience. The roots on TM are very coarse compared to other type of trees. The one thing I want to emphasize when doing TM airlayer is to map the gap as wide as you can. The last one I open about three weeks ago shown no root due to bridging.... And the gap I cut was twice the diameter of the trunk. So now I have a hardwood cutting going on. Will.see if it will send out roots in Spring.
In your first pictures I was wondering whether you have removed the cambium properly. I think I can see traces of it still. I doubt it is the width of the gap per se..
This is the key point! let it air out for a little bit and scrape anything that turn color. Once it stays white after a few minutes of being scarped you are good to add the media you'll be using.
I have done airlayer for quite a few.... I scape some of the hardwood as well. In this case I didn't bag them for a whole week. All took except one. Here is the photo of it when I open it.
