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$mylovelydata= {
       'Colour'=>'blue',
...
                  }
         },
};

  my $colour;
  if defined($data->{'Entries'}->{'Flowers'}->$flower->{'Colour'})
...
  if defined($data->{'Entries'}->{'Colour'}) 
{$colour=$data->{'Entries'}->{'Colour'};};
  if defined($data->{'Colour'}) {$colour=$data->{'Colour'};};