| Cultivar Name | Plant Size | Origin | Flower Color | Season | Source | Registered |
| 'P.M. Stripe' | - | Sport | - | - | Unknown | --NR-- |
| 'Pacific Sunlight' | Large | Unknown | - | - | Duback, Robyn | .1998 |
| 'Pagoda' | - | Hybrid | - | - | Smith, Eric & British Hosta and Hemerocallis Society | .1988 |
| 'Palatina On Stage' | Large | Sport | Pale-Lavender | July | Kirschenlohr, Andreas | --NR-- |
| 'Pale Gold' | Large | Unknown | Pale-Lavender | July | Fisher, Eunice V. & Ruh, Peter | .1997 |
| 'Pale Moon Rising' | Large | Hybrid | - | - | Lysne, Rod | --NR-- |
| 'Pale River' | Small | Unknown | - | July into August | Schulz, Ed | .2014 |
| 'Pamela Ann' | Small | Unknown | - | - | Bentley Gardens | --NR-- |
| 'Panda Bear' | Small | Sport | Med-Lavender | June into July | Hadrava, Jerry | --NR-- |
| 'Panning for Gold' | Medium | Hybrid | - | July into August | Freeman, Franc & Freeman, Sally | .2009 |
| 'Papa's Gold' | Medium | Hybrid | Near-White | June | Snyder, Ron | .2000 |
| 'Paper Moon' | - | Unknown | - | - | Lydell, Ransom | --NR-- |
| 'Paradise Goldheart' | Medium | Sport | Med-Lavender | June into July | Fransen, Marco | --NR-- |
| 'Paradise Sandstorm' | Medium | Sport | Pale-Lavender | July into August | Fransen, Marco | --NR-- |
| 'Paradise Tritone' | Small | Sport | - | - | Fransen, Marco & Fransen, Joyce | --NR-- |
| 'Patent Leather Lemon' | Large | Unknown | - | - | Unknown | --NR-- |
| 'Pay Day' | Medium | Hybrid | Pale-Lavender | July | Malloy, Alex | .2003 |
| 'PeeDee Apollo' | Medium | Hybrid | Light-Purple | August to October | Syre-Herz, Ursula | .1996 |
| 'PeeDee Picotee' | Medium | Hybrid | Pale-Lavender | June into July | Syre-Herz, Ursula | .1992 |
| 'PeeDee Summerdream' | - | Unknown | - | - | Syre-Herz, Ursula | --NR-- |
| 'PeeDee Treasure' | Small | Hybrid | Light-Purple | July | Syre-Herz, Ursula | .1989 |
| 'Peking' | Medium | Unknown | Pale-Lavender | July | Stone, David & Ruh, Peter & Ruh, Jean | .2005 |
| 'Perchance' | Medium | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Percussion' | Small | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Pert' | Small | Unknown | - | June into July | Schulz, Ed | .2012 |
| 'Petit Prince' | Small | Unknown | - | - | Fafard, Serge | --NR-- |
| 'Pfifferling' | - | Unknown | - | - | Kohlein, Fritz | --NR-- |
| 'Pharoah's Gold' | Large | Unknown | - | - | Rawson, Don | --NR-- |
| 'Phyllis' | Large | Hybrid | Pale-Lavender | June into July | Dean, Don & Weidman, Jim | .2015 |
| 'Pieces of Eight' | Small | Hybrid | - | - | Stegeman, Bev & Stegeman, Dave | --NR-- |
| 'Piedmont Gold' | Large | Hybrid | Near-White | June into July | Stone, David & Payne, Henry | .1982 |
| 'Piedmont's Gold Miniature' | Miniature | Unknown | Light-Purple | July | Stone, David & Payne, Henry | --NR-- |
| 'Pike's Peak' | Medium | Unknown | - | July into August | Plater-Zyberk, Maria & Walek, Kevin | .2009 |
| 'Pineapple Juice' | Small | TC Sport | Pale-Lavender | August | Zilis, Mark | .2003 |
| 'Pineapple Zest' | Small | Hybrid | - | - | Zilis, Mark | .2010 |
| 'Pink Flamingo' | Large | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Piper Cub' | Small | Hybrid | Pale-Lavender | July into August | Cross, Peter | .2002 |
| 'Pistachio Glow' | Small | Hybrid | Near-White | July | Savory, Robert | .1990 |
| 'Pixie Gold' | Small | Unknown | - | - | Rawson, Don | --NR-- |
| 'Plain Jane' | Medium | Hybrid | Pure-White | June into July | Benedict, Dr Ralph (Herb) & Wade, Van | .2007 |
| 'Platinum Blonde' | Large | Unknown | - | - | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Platinum Nugget' | Large | Sport | Near-White | June into July | Summers, Alex & Walek, Kevin | .2009 |
| 'Pot of Gold' | Small | Sport | Pale-Lavender | July | Hansen, Hans | --NR-- |
| 'Pot O'Gold' | Small | Unknown | - | - | Malloy, Alex | --NR-- |
| 'Prairie Dazzler' | Large | Hybrid | Pale-Lavender | July into August | Zilis, Mark | .2009 |
| 'Prairie Fire' | Medium | Hybrid | Near-White | July | Kuk, Bob | .1994 |
| 'Prairie Glow' | Large | Sport | Pale-Lavender | July | Zilis, Mark & Ruh, Peter | .2002 |
| 'Prairie Moon' | Medium | Hybrid | Pale-Lavender | August | Hansen, Hans | .2007 |
| 'Prairie Spring' | Medium | Hybrid | - | June into July | Kedl, Phyllis | .2010 |
| 'Prairie Sum Shine' | Giant | Sport | Med-Lavender | July into August | Metz, Mary Ann | .2009 |
| 'Prairieland Memories' | Medium | TC Sport | Pure-White | August | Zilis, Mark | .2003 |
| 'Preconscious' | Large | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Pretty Girl' | Large | Unknown | Pale-Lavender | - | Livingston, Ron | --NR-- |
| 'Pretty Peggy' | Medium | Hybrid | - | - | Wade, Van | .1999 |
| 'Primavera Primrose' | Large | Sport | Pale-Lavender | July into August | Grenfell, Diana | --NR-- |
| 'Princess Kendra' | Medium | Hybrid | Near-White | July into August | Stygall, Patsy | .2007 |
| 'Purple Flame Forever' | Miniature | Hybrid | - | - | Zilis, Mark | .1988 |
| 'Purple Moon' | Medium | Hybrid | Light-Purple | July into August | Adams, Joy | .2010 |
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