| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Pacific Blue Edger' | - | - | - | - | Sport | - | - | Duplicate Name | --NR-- |
| 'Pacific Crest' | Small | Med-Green | - | - | Unknown | Pale-Lavender | - | Janssen, Bill | --NR-- |
| 'Pacific Lace' | Small | Med-Green | - | - | Unknown | Med-Lavender | - | Janssen, Bill | --NR-- |
| 'Pacific Panorama' | Large | Med-Green | Medial | White | Hybrid | Near-White | June into July | Heims, Dan | --NR-- |
| 'Pacific Rim' | Medium | Dark-Green | Marginal | Yellow | Unknown | - | - | Janssen, Bill | --NR-- |
| 'Pacific Sunlight' | Large | Yellow | - | - | Unknown | - | - | Duback, Robyn | .1998 |
| 'Pacific Sunrise' | - | - | - | - | Unknown | - | - | Janssen, Bill | --NR-- |
| 'Pacific Sunset' | Medium | Med-Green | Marginal | White | Unknown | Light-Purple | July | Goodwin, Randy | .2003 |
| 'Painted Desert' | Large | Blue/Green | Streaked | White | Unknown | - | - | Moore, Jeff | --NR-- |
| 'Pale River' | Small | Yellow | - | - | Unknown | - | July into August | Schulz, Ed | .2014 |
| 'PAL's Plymouth Rock' | Medium | Light-Green | - | - | Sport | Near-White | June into July | Lehtola, Paula | .2008 |
| 'Pangaea' | Giant | Blue/Green | - | - | Unknown | - | - | Wade, Van | --NR-- |
| 'Paradise Beach' | Medium | Med-Green | Medial | Yellow | Sport | Pure-White | August | Fransen, Marco | --NR-- |
| 'Paradise Creek' | Large | Med-Green | Marginal | Yellow | Unknown | | | Smith, Fred | --NR-- |
| 'Parfrey's Glen' | - | - | Streaked | - | Unknown | - | - | Moore, Jeff | --NR-- |
| 'Parisian Silk' | Medium | Blue/Green | - | - | Hybrid | Med-Lavender | August to September | Dean, Don | .2009 |
| 'Park Avenue' | Large | Med-Green | - | - | Unknown | - | - | Minks, Eldren | --NR-- |
| 'Parthenon' | Medium | Light-Green | Streaked | Speckles | Sport | Pure-White | August to September | Zilis, Mark | .2010 |
| 'Patagonian' | Giant | Blue/Green | - | - | Unknown | Near-White | July | Wade, Van | --NR-- |
| 'Pearl Lake' | Medium | Blue/Green | - | - | Unknown | Pale-Lavender | July | Stone, David & Payne, Frank | .1982 |
| 'Pebble Beach' | Medium | Blue/Green | - | - | Unknown | Near-White | - | Woodroffe, Fleeta Brownell | .1972 |
| 'Pebble Creek Aberdeen Mountain' | Medium | Blue/Green | - | - | Hybrid | Pale-Lavender | August | Kovalcsik, Joanna | --NR-- |
| 'PeeDee Laughing River' | Medium | Med-Green | Marginal | Yellow | Hybrid | Light-Purple | August | Syre-Herz, Ursula | .1992 |
| 'Peking' | Medium | Yellow | - | - | Unknown | Pale-Lavender | July | Stone, David & Ruh, Peter & Ruh, Jean | .2005 |
| 'Pelham Blue Tump' | Small | Blue/Green | - | - | Hybrid | Pale-Lavender | July | Kitchingman, Richard | .1986 |
| 'Penny Lane' | Miniature | Med-Green | Marginal | White | Unknown | Med-Lavender | June | Wasitis, Chick | .2021 |
| 'Peoria Knickers' | - | - | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Philadelphia' | Medium | Blue/Green | - | - | Sport | Near-White | July | Silvers, Bill | .2006 |
| 'Phoenix' | Large | Med-Green | - | - | Hybrid | Med-Lavender | - | Fischer, Dr Ulrich | --NR-- |
| 'Phoenix Feathers' | Large | Yellow | | | Hybrid | | | Wols, Dan | --NR-- |
| 'Piccadilly Circus' | Medium | Dark-Green | - | - | Unknown | - | August to September | Ruh, Peter & Ruh, Jean | .2005 |
| 'Pike's Peak' | Medium | Yellow | - | - | Unknown | - | July into August | Plater-Zyberk, Maria & Walek, Kevin | .2009 |
| 'Pinani Island Surf' | Small | Yellow | Marginal | White | Unknown | - | - | Pinder, Jeff | --NR-- |
| 'Pine Hill' | Small | Med-Green | - | - | Unknown | Light-Purple | August | Lydell, Ransom | --NR-- |
| 'Pipestone' | Small | Med-Green | Marginal | White | Sport | Pale-Lavender | - | Johnson, Suzy | --NR-- |
| 'Pixie Falls' | Miniature | Light-Green | Marginal | Blue-Green | Unknown | | | Unknown | --NR-- |
| 'Plaschken' | Small | Dark-Green | - | - | Sport | Light-Purple | July into August | Lokies, Martin | .2010 |
| 'Playin' Peoria' | Miniature | Blue/Green | - | - | TC Sport | Near-White | July into August | Mortko, Rob & Ankney, Barry | .2018 |
| 'Pleasant Hill' | Medium | Med-Green | - | - | Sport | Med-Lavender | August to September | Unknown | --NR-- |
| 'Plum Creek' | Medium | Blue/Green | Medial | Yellow | Hybrid | Near-White | June | Sisson, Kathie | --NR-- |
| 'Plymouth Harbor' | Medium | Blue/Green | Marginal | Green | Unknown | | | Goodenough, Rick | --NR-- |
| 'Plymouth Harbormaster' | Large | Blue/Green | Streaked | Yellow | Unknown | - | - | Goodenough, Rick | --NR-- |
| 'Plymouth Rock' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Poet's Way' | Medium | Med-Green | | | Unknown | | | Goodenough, Rick | --NR-- |
| 'Point Judith Light' | Medium | Dark-Green | - | - | Hybrid | - | - | Goodenough, Rick | --NR-- |
| 'Polar Sky' | Large | Dark-Green | Medial | Yellow | Unknown | Pure-White | June into July | Postlewaite, Peter | .2021 |
| 'Polynesia' | Medium | Blue/Green | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Pondering Parsippany' | Large | Med-Green | - | - | Hybrid | - | - | Moore, Jeff | --NR-- |
| 'Porlock Hill' | Large | Dark-Green | - | - | Unknown | - | - | Terpening, Kent | --NR-- |
| 'Potomac Glory' | Large | Dark-Green | Medial | Yellow | Sport | Pale-Lavender | July | Whitmore, Bob | .2001 |
| 'Potomac Pride' | Large | Dark-Green | - | - | Hybrid | Light-Purple | July | Avent, Tony | .1995 |
| 'Potomac River' | Large | Light-Green | - | - | Sport | Light-Purple | July | Van Eechaute, Danny | --NR-- |
| 'Potomac Splash' | Large | Dark-Green | Streaked | White | Sport | Light-Purple | July | Unknown | --NR-- |
| 'Powder Point' | Large | Blue/Green | Medial | Yellow | Unknown | - | - | Goodenough, Rick | --NR-- |
| 'Prime Meridian' | Large | Blue/Green | Marginal | Yellow | Unknown | Pale-Lavender | June into July | Chastain, Mary & Goodwin, Randy | .2005 |
| 'Princess of Karafuto' | Large | Dark-Green | Marginal | Yellow | Unknown | Pure-White | August | Soules, Marjorie | .1984 |
| 'Prize of Portland' | - | - | - | - | Duplicate | - | - | Duplicate Name | --NR-- |
| 'Promised Land' | Medium | Med-Green | Streaked | White | Hybrid | Light-Purple | July into August | Malloy, Alex | .2004 |
| 'Purbeck Ridge' | Medium | Blue/Green | - | - | Unknown | Pale-Lavender | July into August | Smith, Eric & British Hosta and Hemerocallis Society | .1988 |
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