- Jack Bridger (s) - Pale blush pink. Hammett, 1981.
- Jack Newbury (s) - Pale blue.
- Jacqueline Ann (s) - Deep lavender, cream ground. 2008.
- Jacqueline O'Brien (s) - Orange-red. 1998.
- Janet (e) - A Cuthbertson Florabunda with white flowers. Cuthberson.
- Janet Amy (s) - White flushed pink. Grayson, 1993.
- Janet Amy (s) - Lavender. 1998.
- Janet Scott (g) - Clear pink. Morse, 1903.
- Janetta Harrod (s) - Cream. Harrod, 2006.
- Jayne Amanda (s) - Pale magenta. Truslove, 1984.
- Jeannie (s) - Cream. Harrod, 2007.
- Jemima (s) - Cerise rose pink sweet pea. Beane, 2009.
- Jemma - Deep Blue. Grayson, 1993.
- Jenny (e) - A white Cuthbertson Florabunda sweet pea. Cuthbertson.
- Jessie (e) - A royal mauve Cuthbertson Florabunda variety. Cuthbertson.
- Jewel (s) - Cerise, aka Rowallane. 2006.
- Jill Walton (s) - Salmon pink on cream ground. A lovely sweet pea, but a poor seeder. 1993
- Jilly (s) - The best modern cream sweet pea for exhibition. Harriss, 1988.
- Jim (s) - Cream. 2008.
- Jimmy (e) - A Cuthbertson Florabunda sweet pea with scarlet flowers. Cuthbertson.
- Jimmy MacBain (s) - Pale pink. Brewer, 1997.
- Jimmy Young (s) - White. 1998.
- Joan (e) - A rose picotee Cuthbertson Florabunda variety. Cuthbertson.
- John Adie (s) - A new magenta sweet pea. Adie 2009.
- John Gray (s) - Pale pink. Parsons, 2009.
- Joker (s) - Maroon. 1973.
- Joy (e) - A Cuthbertson Florabunda sweet pea with salmon pink flowers. Cuthbertson.
- Joyce Stanton (s) - Dark blue. 2009.
- Jubilee (s) - Lavender flush. 2003.
- Judith Wilkinson (s) - Carmine crimson. 2008.
- June (e) - A salmon rose EMG sweet pea.
- Just Jean (s) - Salmon pink cream ground.
- Just Jenny (s) - Dark blue. 2005.