Brian, I love your maple. You have done some very inspiring work with it. I'm always excited to see this thread come back up with what you're doing next.
About the soil...? I have noticed that the trend these days is to stray almost, if not completely away from organic matter (as in your posts above). It makes perfect sense and I really think there are good reasons to do so. But my reservations arise because of my location. You guys have plenty of humidity and rain out there... here in WY though, humidity is virtually non-existent; in south-eastern WY we are considered "high mountain desert." -- I'm still mixing in organic matter for moisture retention (more with deciduous and barely any with pines). Would perlite be a good substitute? What would you recommend?
Thanks Brian and chansen, I will keep moving that direction then. I'm using mostly turface, but I'll keep looking for a good source of lava.
Pumice is pretty much the same thing... correct? I've heard several people talking about using it.
Akadama is expensive everywhere I've found it. Do you use it on all of your trees? Or mostly on the trees that are further along?
i read a post by cratageous bonsai, michael hagedorn s site, where he stated to put slow release ferts directly at the base of trees to help fuse maples nebari.
http://crataegus.com/2010/11/06/japanese-maple-once-again/
painter
... lava. Pumice is pretty much the same thing... correct?