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I Googled the key words "plant propagation air bubble" and got this,
To prevent an air bubble (embolism) from lodging in the stem where the cut is, immediately place in a container filled with cloning solution or dip in cloning gel. Place cutting into your growing medium - transfer quickly if you are not using cloning gel, If using cloning gel, transferring time is not as critical as the gel will seal the stem.
If you Google "plant propagation embolism" you get the scientific hits.
Cerebro,
I think your point about energetics and osmosis may be valid. I would like to study up a little more on this. Give me some time please.
farmergiles,
You are absolutely a wonderful and kind human being for doing all this for us. Thank you very much.
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