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Old April 12, 2011   #15
dice
Tomatovillian™
 
Join Date: Jan 2007
Location: PNW
Posts: 4,743
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"Topsoil" has a lot of variability in how much native gravel
is in it. That could account for differences in drainage.

This document has a lot of useful information on what
makes a good container mix:
http://edis.ifas.ufl.edu/cn004
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