The Shallcross Challenge Cup is awarded to the exhibitor with the most points in Section 1 Pot Plants at the Annual Garden Show.
The winners of the Shallcross Challenge Cup are listed below from 1985 onwards.
| Year | Shallcross Challenge Cup |
| 2026 | Sheila Harrison |
| 2025 | Ruth Shallcross |
| 2024 | |
| 2023 | |
| 2022 | |
| 2021 | ~ no Garden Show ~ |
| 2020 | ~ no Garden Show ~ |
| 2019 | Cathy Stewart |
| 2018 | Margaret Alexander |
| 2017 | Sheila Harrison/Ruth Shallcross |
| 2016 | Amy Walker |
| 2015 | Ruth Shallcross |
| 2014 | Ruth Shallcross |
| 2013 | R Shallcross |
| 2012 | Ruth Shallcross |
| 2011 | Jenny Allan |
| 2010 | Ruth Shallcross |
| 2009 | Ruth Shallcross |
| 2008 | Ruth Shallcross |
| 2007 | Jenny Allan |
| 2006 | Jenny Allan |
| 2005 | Jenny Allan |
| 2004 | Jenny Allan |
| 2003 | Jenny Allan |
| 2002 | Jenny Allan |
| 2001 | Jenny Allan |
| 2000 | Jenny Allan |
| 1999 | Mrs P M Mackay |
| 1998 | Mrs P M Mackay |
| 1997 | Mrs S Bruce |
| 1996 | Mrs J Riley |
| 1995 | Mrs P M Mackay |
| 1994 | Mrs S Bruce |
| 1993 | Lucinda Sutherland |
| 1992 | MrsP M Mackay |
| 1991 | Mrs J Riley |
| 1990 | Mrs J Riley |
| 1989 | Mrds J C Mackay / Mrs J Riley |
| 1988 | Mrs J C Mackay / Mrs S Bruce |
| 1987 | Mrs B Williams |
| 1986 | Mrs D Campbell |
| 1985 | Mrs D Pollock |