| Cultivar Name | Plant Size | Origin | Flower Color | Season | Source | Registered |
| 'Abba Dabba Do Gold' | Large | Nat-Sport | Pale-Lavender | July | Wade, Van | --NR-- |
| 'Abba Lit' | Medium | Unknown | - | - | Aden, Paul | --NR-- |
| 'Abiqua Golden Boy' | Large | Unknown | - | - | Purtymun, Charles | --NR-- |
| 'Abiqua Recluse' | Large | Hybrid | Near-White | June into July | Purtymun, Charles | .1989 |
| 'Abiqua Zodiac' | Large | Unknown | Light-Purple | July into August | Purtymun, Charles | .1988 |
| 'Academy Ametrine' | Large | Hybrid | Light-Purple | June into July | Chamberlain, Steve | .2005 |
| 'Academy Aureate Piffle' | Medium | Hybrid | Pale-Lavender | June into July | Chamberlain, Steve | .2006 |
| 'Academy Beech Leaf Stack' | Medium | Hybrid | Pale-Lavender | June into July | Chamberlain, Steve | .2015 |
| 'Academy Galadriel' | Medium | Hybrid | Med-Lavender | August to September | Chamberlain, Steve | .2000 |
| 'Academy Gilded Dawn' | Large | Hybrid | Pale-Lavender | July into August | Chamberlain, Steve | .2008 |
| 'Academy Lothlórien' | Large | Hybrid | Pale-Lavender | July into August | Chamberlain, Steve | .2004 |
| 'Academy Yellow Vuvuzela' | Large | Unknown | Pale-Lavender | July | Chamberlain, Steve | .2015 |
| 'Ada Reed' | Medium | Hybrid | Light-Purple | June into July | Suggs, Natalee | .1988 |
| 'Adrian K.' | - | Unknown | - | - | Kohlein, Fritz | --NR-- |
| 'Aestival Festival' | Medium | Unknown | Pale-Lavender | July | Syre-Herz, Ursula | .1996 |
| 'Age of Gold' | Large | Hybrid | Near-White | July into August | Hansen, Hans & Walters Gardens, Inc | .2018 |
| 'Ahamo Gold' | Large | Unknown | Pale-Lavender | July | Geissler, Julia | .1970 |
| 'Alabama Gold' | Large | Hybrid | Pale-Lavender | June into July | Suggs, Natalee | .1986 |
| 'Alaska Gold' | Small | Unknown | Light-Purple | - | Jentsch, Klaus | --NR-- |
| 'Alice Gladden' | Large | Hybrid | Near-White | June into July | Ward, Dr Dick & Jane | .1998 |
| 'Alison' | Large | Hybrid | Pale-Lavender | June into July | Ward, Dr Dick & Jane | .2000 |
| 'All Bright' | Small | Hybrid | Pale-Lavender | June into July | Gilligan, Madelon | .2015 |
| 'All Gold' | Medium | Unknown | Med-Lavender | July into August | Freeman, Franc | --NR-- |
| 'Alma' | Small | Unknown | Light-Purple | August | Krossa, Gus & Ruh, Peter | .1995 |
| 'Alpine Aire' | Medium | Hybrid | Pale-Lavender | July into August | Minks, Eldren | .1980 |
| 'Alter Ego' | Large | Hybrid | - | July | Livingston, Ron | --NR-- |
| 'Amber Glass' | Large | TC Sport | Pale-Lavender | August | Anderson, Jim | --NR-- |
| 'Amber Tiara' | Medium | Nat-Sport | Deep-Purple | July into August | Walters Gardens | .1998 |
| 'Amber Waves' | Large | Hybrid | - | - | Minks, Eldren | --NR-- |
| 'American Gold Cup' | Small | Unknown | Light-Purple | July | Wade, Van | --NR-- |
| 'American Golden Frills' | Medium | Unknown | - | - | Wade, Van | --NR-- |
| 'American Wiggler' | Miniature | Unknown | - | - | Wade, Van | --NR-- |
| 'Ann Knall' | - | Unknown | - | - | Trucks, Gary | --NR-- |
| 'Aomori Gold' | Medium | Nat-Sport | Deep-Purple | August to October | Muroya, Kimio & Zilis, Mark | .2009 |
| 'Apollo' | Large | Hybrid | Light-Purple | July | Syre-Herz, Ursula | --NR-- |
| 'Apple Court Gold' | Small | Hybrid | - | - | Grounds, Roger & Grenfell, Diana | --NR-- |
| 'Appletini' | Small | Hybrid | Light-Purple | August | Zilis, Mark | .2009 |
| 'Arnold Black' | Large | Hybrid | Pale-Lavender | June into July | Ward, Dr Dick & Jane | .2004 |
| 'Artrishia' | Small | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Aspen Gold' | Large | Hybrid | Near-White | June into July | Grapes, Vivian | .1986 |
| 'Aspiring Angel' | Miniature | Hybrid | Light-Purple | July into August | Kwick, Charles | .2019 |
| 'Atom Smasher' | Miniature | Hybrid | - | - | Livingston, Ron | --NR-- |
| 'Audrey's Light' | Miniature | Nat-Sport | Med-Lavender | August | Green Mountain Hosta | --NR-- |
| 'August Moon' | Large | Unknown | Pale-Lavender | July into August | Langfelder, Richard & Ruh, Peter | .1996 |
| 'Auntie Anne' | Giant | Hybrid | Pale-Lavender | June into July | Balitewicz, Bob | --NR-- |
| 'Aurea' H. longipes | Medium | Hybrid | Light-Purple | August to October | Unknown | --NR-- |
| 'Autumn Fire' | Large | Unknown | - | - | Duncan, Mary Jo | .2014 |
| 'Autumn Moon' | Large | Unknown | Pale-Lavender | July | Unknown | --NR-- |
| 'Aye Tea Oh' | Small | Unknown | - | - | Goodwin, Randy | --NR-- |
| 'Aztec Treasure' | Large | Hybrid | Light-Purple | June into July | Vaughn, Kevin | .1987 |
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