| 1993 | e Atlantic Swirl NPS 6127 | - Blackthorn Paragon Ge 785 |
| 1994 | e Calmore Aftermath GBRS 26 | - Trewithian Parc Tamarisk GBRM 1212 |
| 1996 | e Ashfield Mactalla GBRS 72 | - Trewithian Parc Laurel Ge 1024 |
| 1997 | e Ashfield Mactalla GBRS 72 | - Trewithian Parc Jasmine GBRM 1397 |
| 1998 | e Ashfield Mactalla GBRS 72 | - Trewithian Parc Azara GBRM 1654 |
| 1999 | e Ashfield Mactalla GBRS 72 | - Trewithian Parc Genista GBRM 1653 |
| 2000 | e Ashfield Mactalla GBRS 72 | - Trewithian Parc Hawthorn Ge 1362 |
| 2001 | e Ashfield Mactalla GBRS 72 | - Trewithian Parc Blackthorn Ge 1748 |
| 2002 | e Ashfield Mactalla GBRS 72 | - Trewithian Rowan Ge 1583 |
| 2003 | e Ashfield Mactalla GBRS 72 | - Trewithian Sycamore Ge 1824 |
| 2004 | e Ashfield Mactalla GBRS 72 | - Trewithian Hornbeam Ge 1852 |
| 2006 | e Ashfield Mactalla GBRS 72 | - Trewithian Japonica GBRM 2090 |
| 2008 | e Ashfield Mactalla GBRS 72 | - Trewithian Cornus |
| 2009 | e Ashfield Mactalla GBRS 72 | - Trewithian Parc Rubus |
| 2010 | e Ashfield Mactalla GBRS 72 | - Trewithian Parc Acer |
| 2011 | e Ashfield Mactalla GBRS 72 | - Trewithian Ash |