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Tips:5¢ Advice:Free
Join Date: Aug-2001
Location: Silicon Valley
Country: USA
Posts: 9,745
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I think that method was covered in Bonsai Today roughly five years ago. There was an article involving air layering a huge cryptomeria trunk from a garden tree. I think it was Mr Mitsuya's article. Anyway they cut a channel, wrap a thick aluminum wire around, tighten with pliers and then pound it in with a mallet. Sometimes a second wire is added beneath the first - keeps it from slipping and really reduces the likelihood of any bridging taking place.
The thinking is that copper, like other heavy metals can inhibit the rate of growth of roots. I have no idea how much toxic copper might actually leach from a piece of bonsai wire, but one of the ways they used to prospect for copper ore is to look for naturally dwarfed trees.
Regards,
Matt
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