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Greybeard
Join Date: Aug-2001
Location: Fresno, CA
Country: USA
Posts: 5,247
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Out here in California, bentonite is used in a slurry form and sprayed on the walls of bare dirt to form ponds. When the stuff dries it is fairly waterproof and keeps the water from sinking into the soil. I can only imagine how this would perform in a bonsai pot in which we try to encourage free draining.
ak
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