- Ida King (s) - Lavender. King, 2007.
- Imogen (s) - Rose pink on cream ground. 2001.
- Indigo King (g) - This very old sweet pea has a dark blue standard and paler wings. Eckford, 1885.
- Inferno (s) - An orange scarlet sweet pea. 2010.
- Irene (s) - Mauve.
- Isabella Cochrane (s) - Lavender flush. Chisholm, 2001.
- Ivory Queen (s) - Cream. 1994.