| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Abby' | Small | Med-Green | Marginal | Yellow | Sport | Pale-Lavender | June into July | Ruh, Peter | .1990 |
| 'Abiqua Big Sky' | Giant | Blue/Green | - | - | Unknown | - | June into July | Purtymun, Charles & Ruh, Peter | .2008 |
| 'Akane' | Medium | Dark-Green | - | - | Unknown | Light-Purple | August to September | Watanabe, Kenji & Hawes, James & Ruh, Peter & Ruh, Jean | .2010 |
| 'Aksarben' | Giant | Blue/Green | - | - | Hybrid | Near-White | June into July | Geissler, Julia & Ruh, Peter | .1988 |
| 'Alaskan Halo' | Large | Med-Green | Marginal | White | Sport | Pale-Lavender | July into August | Ruh, Peter | .1997 |
| 'Albert Lea' | Large | Blue/Green | - | - | Sport | Near-White | June into July | Ruh, Peter | .1999 |
| 'Allegan Emperor' | Giant | Blue/Green | - | - | Hybrid | Pale-Lavender | July | Herrema, Ken & Deshane, H. & Ruh, Peter | .2000 |
| 'Allegan Fog' | Medium | Med-Green | Streaked | Speckles | Hybrid | Pale-Lavender | July into August | Herrema, Ken & Ruh, Peter | .2000 |
| 'Allegan Gent' | Large | Blue/Green | Marginal | Speckles | Sport | Near-White | June into July | Herrema, Ken & Ruh, Peter | .2000 |
| 'Alma' | Small | Yellow | - | - | Unknown | Light-Purple | August | Krossa, Gus & Ruh, Peter | .1995 |
| 'Amanuma' | Small | Med-Green | - | - | Hybrid | Light-Purple | July | Maekawa, Dr Fumio & Ruh, Peter | .2002 |
| 'Amethyst Joy' | Medium | Green | - | - | Hybrid | - | July into August | Sugita, Hajime & Ruh, Peter | .2000 |
| 'Andrew Jackson' | Giant | Blue/Green | - | - | Unknown | Near-White | June into July | Sugita, Hajime & Ruh, Peter & Ruh, Jean | .2001 |
| 'Ani Machi' | Medium | Med-Green | Medial | Greenish White | Unknown | Light-Purple | August to September | Ruh, Peter & Ruh, Jean | .2002 .2018 |
| 'Antioch' | Large | Med-Green | Marginal | Creamy White | Unknown | Pale-Lavender | July into August | Tompkins, Cynthia & Hofer, Paul & Ruh, Peter | .1979 |
| 'Arctic Circle' | Medium | Med-Green | Marginal | White | Unknown | Pale-Lavender | July into August | Tompkins, Chet & Ruh, Peter & Ruh, Jean | .2002 |
| 'Arctic Sunset' | Medium | Light-Green | Streaked | Yellow | Sport | Med-Lavender | August to September | Ruh, Peter & Ruh, Jean | .2005 |
| 'August Moon' | Large | Yellow | - | - | Hybrid | Pale-Lavender | July into August | Langfelder, Richard & Ruh, Peter | .1996 |
| 'Azure Cherub' | Medium | Blue/Green | - | - | Unknown | Pale-Lavender | July into August | Ruh, Peter | .2002 |
| 'Azure Snow' | Large | Blue/Green | - | - | Hybrid | Pale-Lavender | August to October | Ruh, Peter | .1991 |
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