| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Pale Gold' | Large | Yellow | | | Hybrid | Pale-Lavender | July | Fisher, Eunice V. & Ruh, Peter | .1997 |
| 'Parky's Perfection' | Medium | Dark-Green | Medial | Yellow | Sport | Med-Lavender | June to July | Ruh, Peter | .2002 |
| 'Pastures New' | Small | Med-Green | | | Hybrid | Pure-White | July | Summers, Alex & Ruh, Peter | .1997 |
| 'Paul Bunyan' | Large | Blue/Green | | | Unknown | Near-White | June to July | Tompkins, Chet & Ruh, Peter & Ruh, Jean | .2009 |
| 'Pauline' | Small | Med-Green | | | Unknown | Med-Lavender | August to September to October | Stone, David & Ruh, Peter | .1987 |
| 'Paul's Glory' | Large | Yellow | Marginal | Blue-Green | Sport | Pale-Lavender | July to August | Hofer, Paul & Hofer, Linda & Ruh, Peter | .1987 |
| 'Peerless' | Large | Med-Green | | | Unknown | Pale-Lavender | August | Tompkins, Chet & Ruh, Peter & Ruh, Jean | .2001 |
| 'Pegasus' | Small | Med-Green | Medial | White | Sport | Pale-Lavender | June to July | Ruh, Peter & Ruh, Jean | .2001 |
| 'Peking' | Medium | Yellow | | | Unknown | Pale-Lavender | July | Stone, David & Ruh, Peter & Ruh, Jean | .2005 |
| 'Perry's True Blue' | Large | Blue/Green | | | Hybrid | Near-White | June | Grullemans, John J. & Hofer, Paul & Hofer, Linda & Ruh, Peter | .1981 |
| 'Peter The Rock' | Large | Light-Green | | | Hybrid | Pure-White | June | Simpers, Lucille & Ruh, Peter | .1991 |
| 'Pete's Passion' | Large | Yellow | Marginal | Dark Green | Sport | Pale-Lavender | July to August | Ruh, Peter | .1997 |
| 'Petticoat Pink' | Medium | Light-Green | | | Hybrid | Med-Lavender | August to September | Sugita, Hajime & Ruh, Peter & Ruh, Jean | .2001 |
| 'Piccadilly Circus' | Medium | Dark-Green | | | Unknown | Unknown | August to September | Ruh, Peter & Ruh, Jean | .2005 |
| 'Powder Blue' | Giant | Blue/Green | | | Unknown | Pale-Lavender | June | Sugita, Hajime & Ruh, Peter | .1998 |
| 'Prairie Glow' | Large | Yellow | | | Unknown | Pale-Lavender | July | Zilis, Mark & Ruh, Peter | .2002 |
| 'Purbeck Mist' | Small | Blue/Green | | | Unknown | Light-Purple | July | Smith, Eric & Ruh, Peter | .2005 |
| 'Purple Charmer' | Medium | Med-Green | | | Hybrid | Light-Purple | August | Lantis, Clarence & Ruh, Peter | .1993 |
| 'Purple Essence' | Medium | Med-Green | | | Hybrid | Light-Purple | Unknown | Zilis, Mark & Ruh, Peter | .2005 |
| 'Purple Passion' | Medium | Med-Green | | | Unknown | Light-Purple | July to August | Benedict, Dr Ralph (Herb) & Ruh, Peter | .2005 |
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