- Gaiety (s) - Bicolour.
- Garden News (s) - Scarlet. 1999.
- Geoff Amos (s) - Crimson fancy. 1999.
- Geoff Hamilton (s) - Mauve. 1997.
- Geoff Hughes (s) - Orange stripe. Sarrer, 2009.
- George Priestley (s) - An intense mauve flush sweet pea with rich fragrance. Priestley, 2009.
- Geranium Pink (s) - A very old orange red sweet pea.
- Gerry Cullinan (s) - Lavender on cream ground. Kerton, 2007.
- Gigantic (s) - This old white flowered sweet pea was an outstanding exhibition variety in the 1930s and 1940s.
- Glacier (s) - White. Harrod.
- Glasnevin (s) - White. Harrod, 2006.
- Gloria (e) - A deep rose EMG variety.
- Glow (s) - Orange/pink bicolour. 1997.
- Gorleston (s) - Mauve.
- Grace (e) - An EMG sweet pea with lavender flowers.
- Grace of Monaco (s) - Rose pink on awhite ground.
- Gracious Lady (s) - Pale pink on cream ground. 2003.
- Grandma Butt (s) - Rosy magenta. 2006.
- Great Expectations (s) - Lavender. 1994.
- Grenadier (e) - A scarlet Spencer Praecox variety.
- Gwendoline (s) - A superb modern bright pink sweet pea, classed as a magenta by the NSPS. Kerley, 1999.
- Gypsy Queen (s) - Crimson. 1965.
- Gypsy Rose (s) - Rose pink on a cream ground. 1984.