From PlantFacts
Revision as of 16:15, 6 December 2005 by (talk)
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1. a hard, compacted, often clayey layer of soil through which roots cannot grow.


This photo depicts the various layers of soil with the hardpan layer just below the loose topsoil. Note the small plant with no roots extending into the dense clay soil.
Source: http://www.wantfa.com.au