in reply to Growing a Hash of Hashes via its reference

In sub find_misfits, $misfits is a hash ref., so you need to change... 
$misfits{$stand}{$mother}{$offspring} = {%{$candidate{$stand}{$mother}
+{$offspring}}};

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to read 
$misfits->{$stand}{$mother}{$offspring} = {%{$candidate{$stand}{$mothe
+r}{$offspring}}};

[download]
A user level that continues to overstate my experience :-))

In Section Seekers of Perl Wisdom