Horizontal Juniper Layer

[MaxChavez]

Hello,
Any tips for air-layering a large horizontal juniper branch?
From what I understand, auxins/hormones/roots will "sink" and really only form on the underside. Is it possible that will be sufficient and then I can re-wound the top side after separating the layer and orienting more vertically?
Would a 6in long underside "strip" work for a raft-style planting? I would still cut a full collar all the way around, but then also a strip along the bottom for more roots to form.
Any thoughts are welcome, thanks!

 

[Wires_Guy_wires]

Regardless of hormones and gravity, I've noticed that junipers produce roots if there's moisture available. That seems to be the biggest trigger.

Gravitropism plays a part sometimes, but generally speaking most plants ignore that when the favorable conditions are enough to evoke a response.

Do make sure you're not looking at a cypres tree though, they can look very similar.

 

[Esolin]

That looks like a Hollywood Juniper. I've heard they are tougher to root than your average juniper. Make sure you use the right strength rooting hormone to improve your chances.