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Attila Soos
Join Date: Jan-2002
Location: Los Angeles, California
Country: USA
Posts: 1,986
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It has to do with the moist air around the tree.
When I pruned the jade bush outside in my backyard, the fallen branches sent out roots at the point of touching the moist ground. After a few weeks, all the cut branches were firmly rooted, just from touching the ground.
So, I think that the moisture in your air induced those roots, even though there is no soil touching them.
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