- Pageantry (s) - Maroon.
- Painted Lady (s) - Pink/white bicolour. The name dates to 1737, but the form grown now is much more recent.
- Pall Mall (s) - Mauve.
- Pamela (s) - Lavender.
- Panache (s) - Mauve.
- Pandemonium (s) - Purple Flake. Hammett, 2009.
- Party Time (s) - Picotee. 1993.
- Pastel Pink (s) - Salmon pink on cream. 2006.
- Patricia Anne (s) - Lavender flush. Sutton, 2006.
- Patti (e) - A salmon EMG variety.
- Peacock (s) - Pale mauve. 2003.
- Pearl (e) - A white EMG sweet pea.
- Pearl (s) - Pale pink on cream. 1998.
- Pearl Buck (e) - A rose pink Spencer Praecox.
- Peggy (e) - A mauve Cuthbertson Florabunda sweet pea. Cuthbertson.
- Pennine Floss (s) - Carmine.
- Percy Thrower (s) - A rather insipid lavender flush sweet pea with a strong fragrance. B R Jones, 1984.
- Philip Miller (g) - A cerise old fashioned sweet pea, flecked blue. Grayson, 1996.
- Phoebe (s) - An orange-red flake on a cream ground. 1998.
- Pink Bouquet (s) - Salmon pink on white ground.
- Pink Expression (s) - Rose pink on cream.
- Pink Leamington (s) - Salmon pink on cream.
- Pink Pageant (s) - Salmon pink on cream.
- Pink Panther (s) - Almond pink.
- Pink Pearl (s) - Pale pink. Unwin, 2006.
- Pip Tremewan (s) - Purple. Named after a noted sweet pea breeder. 1999.
- Pip's Maroon (s) - Dark maroon. Tremewan/Carr/Parsons, 2008.
- Pluto (s) - Deep purple blue.
- Pocahontas (s) - Cerise. Harrod, 2006.
- Polly Wilson (s) - Mid blue. 1978.
- Pretty Polly (s) - Orange-pink. 1993.
- Prima Donna (g) - A soft pink grandiflora sweet pea which gave rise to the Spencer mutation. Eckford. 1896.
- Prince Edward of York (g) - A rosy salmon grandiflora sweet pea. Eckford, 1897.
- Princess Blue (e) - A blue Spencer Praecox variety.
- Princess Elizabeth (s) - Salmon pink on cream. Bolton, 1950.
- Princess Juliana (s) - Almond pink on crean. 1995.
- Princess of Wales (g) - Mauve stripe on white. Eckford, 1888.
- Promise (s) - Pink/white bicolour. Parsons, 2006.
- Pulsar (s) - See 'Lilac Ripple'. 1997.
- Purple Prince (g) - Maroon/purple bicolour with matt petals. Eckford, 1886.