Sigh...
Vance, as you know, the “it depends” rule trumps all other “rules”. The “rules” are guidelines that give folks a starting point upon which to build their own personal “rule book”.
I don’t mess with Mugos at all. They’re just not compatible with my climate. I don’t dispute anything you say about them, because I just don’t have any experience with them. When I tried to grow them 60 years ago, they all died. My JBP lived. Granted, I know far more about bonsai and tree keeping now than I did 59 years ago, but I just don’t need to mess with them when I can grow JBP and JWP.
Junipers is a whole different matter. You still don’t understand the “don’t pinch junipers” concept. It’s not about scissors vs fingers. It where to cut back to thin. And it’s NOT at the Silohette. The whole “don’t pinch” thing should really be titled “thin out your juniper canopy”.
Here’s a couple of pictures of a juniper properly cleaned and thinned:
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Notice that you can see the woody stems holding up the foliage in the pads. Notice that there is no green foliage below the woody branches in the bottom of the pads. Notice that sun light can enter and reach the interior of the tree. Notice that there aren’t single large clumps if foliage, but there are many small individual tufts.
I was able to do this without a single “pinch” or cut or anything at the outer Silohette. All foliage removal was done by removing old interior foliage that wasn’t showing bright green new growth, and I did this with my fingers. Where foliage was too dense, it was cut back at a joint, brown stem area, with scissors, removing tufts of foliage about 3/4 inch in length.
About akadama: yes, it breaks down. When it does, repot. If akadama is too expensive, just use a 50/50 mix lava and pumice. Not all akadama is created equal. Some is harder than others. My akadama doesn’t break down to mush the way some people claim. But, i repot when the tree begins to drain slowly, so it doesn’t matter.
Meanwhile, I do hope you’re doing well, and are able to enjoy your trees. I hope you and your Mugos have a great spring and summer!