| Cultivar Name | Plant Size | Origin | Flower Color | Season | Source | Registered |
| 'A Burgh Thing' | Large | Unknown | - | June into July | Danik, Robert & Danik, K. | .2009 |
| 'A Scape Plan' | Medium | Hybrid | Pale-Lavender | August | Avent, Tony | --NR-- |
| 'Aachen' | Medium | Hybrid | - | June into July | Malloy, Alex | .2005 |
| 'Abba Blue Flight' | Medium | Unknown | - | - | Aden, Paul | --NR-- |
| 'Abba Blue Prayers' | Giant | Unknown | - | - | Aden, Paul | --NR-- |
| 'Abba Rough' | Medium | Unknown | Near-White | June into July | Aden, Paul | --NR-- |
| 'Abiqua Ariel' | Small | Hybrid | Near-White | June into July | Purtymun, Charles & Hyslop, Jay | .1999 |
| 'Abiqua Aries' | Medium | Hybrid | Near-White | July | Purtymun, Charles & Hyslop, Jay | .1999 |
| 'Abiqua Big Sky' | Giant | Unknown | - | June into July | Purtymun, Charles & Ruh, Peter | .2008 |
| 'Abiqua Blue Crinkles' | Medium | Unknown | Near-White | June into July | Purtymun, Charles | .1999 |
| 'Abiqua Blue Edger' | Small | Unknown | Pale-Lavender | July | Purtymun, Charles | .1987 |
| 'Abiqua Blue Hearts' | Small | Unknown | Pure-White | June into July | Purtymun, Charles & Zilis, Mark | .2009 |
| 'Abiqua Blue Jay' | Medium | Unknown | Pale-Lavender | July into August | Purtymun, Charles | .1988 |
| 'Abiqua Blue Madonna' | Medium | Unknown | Pale-Lavender | July | Purtymun, Charles | .1988 |
| 'Abiqua Blue Shield' | Large | Unknown | Near-White | June into July | Purtymun, Charles | .1988 |
| 'Abiqua Drinking Gourd' | Large | Hybrid | Near-White | June into July | Purtymun, Charles | .1989 |
| 'Abiqua Elephant Ears' | Giant | Hybrid | Pale-Lavender | July into August | Purtymun, Charles | .1999 |
| 'Abiqua Hallucination' | Medium | Sport | Pale-Lavender | July into August | Purtymun, Charles & Hyslop, Jay | .1988 |
| 'Abiqua Pagoda' | Giant | Hybrid | Near-White | June into July | Purtymun, Charles | .1989 |
| 'Abiqua Parasol' | Giant | Hybrid | Near-White | June into July | Purtymun, Charles | .1987 |
| 'Abiqua Trumpet' | Small | Unknown | Pale-Lavender | July into August | Purtymun, Charles | .1987 |
| 'Abraham Lincoln' | Medium | Hybrid | Light-Purple | June into July | Beilstein, Doug & Zilis, Mark | .2009 |
| 'Abundant Love' | Giant | Hybrid | Pure-White | July | Beilstein, Doug & Beilstein, Mardy | .2017 |
| 'Academy Blue Borealis' | Large | Unknown | - | - | Chamberlain, Steve | --NR-- |
| 'Academy Blue Funnel' | Large | Unknown | Pale-Lavender | June into July | Chamberlain, Steve | .2008 |
| 'Academy Blue Titan' | Large | Unknown | Pure-White | June | Chamberlain, Steve | .1999 |
| 'Academy Celeborn' | Large | Hybrid | Pure-White | July | Chamberlain, Steve | .2000 |
| 'Academy Crated Blue' | Small | Unknown | - | - | Chamberlain, Steve | --NR-- |
| 'Academy Cratered Blue' | Giant | Unknown | Near-White | July | Chamberlain, Steve | --NR-- |
| 'Academy Dark Space' | Medium | Sport | Med-Lavender | July into August | Chamberlain, Steve | .2015 |
| 'Academy Tousled Turkey' | Large | Hybrid | Med-Lavender | June into July | Chamberlain, Steve | .2001 |
| 'Adipose Donkey' | Medium | Hybrid | - | - | Moore, Jeff | --NR-- |
| 'Agawa' | Giant | Hybrid | Near-White | July into August | Wade, Van | .2007 |
| 'Age of Aquarius' | Medium | Hybrid | Near-White | July | Ward, Dr Dick & Ward, Jane | .2011 |
| 'Ah-ha-ha-bah' | Medium | Unknown | Light-Purple | June into July | Wade, Van | --NR-- |
| 'Ahhhs' | Medium | TC Sport | Pale-Lavender | July into August | Mortko, Rob | --NR-- |
| 'Ahr' | Medium | Hybrid | - | - | Klose, Heinz | --NR-- |
| 'Aksarben' | Giant | Hybrid | Near-White | June into July | Geissler, Julia & Ruh, Peter | .1988 |
| 'Alabama Bowl' | Large | Hybrid | Near-White | July | Suggs, Natalee | .1986 |
| 'Albert Lea' | Large | Sport | Near-White | June into July | Ruh, Peter | .1999 |
| 'Aldonna Blue Eyes' | Large | Unknown | - | - | Wade, Van | --NR-- |
| 'Algonquin' | Large | Hybrid | Near-White | June into July | Wade, Van | .2007 |
| 'Alinghi' | Large | Hybrid | Pale-Lavender | August to September | Hirsbrunner, Liselotte | .2003 .2018 |
| 'Allegan Emperor' | Giant | Hybrid | Pale-Lavender | July | Herrema, Ken & Deshane, H. & Ruh, Peter | .2000 |
| 'Alston Green' | Giant | Hybrid | Pale-Lavender | June | Stephens, Ray | .1998 |
| 'Am I Blue' | Giant | Hybrid | Near-White | June into July | Ward, Dr Dick & Ward, Jane | .1998 |
| 'American Angel's Fire' | Giant | Sport | Near-White | June into July | Wade, Van | --NR-- |
| 'American Big Dipper' | Giant | Unknown | Med-Lavender | July | Wade, Van | --NR-- |
| 'American Blue Hearts' | Large | Unknown | Near-White | June into July | Wade, Van | --NR-- |
| 'American Blue Masterpiece' | Giant | Unknown | Near-White | - | Wade, Van | --NR-- |
| 'American Blue Wrinkles' | Giant | Unknown | - | - | Wade, Van | --NR-- |
| 'American Chippewa' | Medium | Unknown | Pale-Lavender | July into August | Wade, Van | --NR-- |
| 'American Cobblestone' | Giant | Unknown | Med-Lavender | July | Wade, Van | --NR-- |
| 'American Gold Canoe' | Medium | Sport | Pale-Lavender | June into July | Wade, Van | --NR-- |
| 'American King of the Woods' | Giant | Hybrid | Near-White | July | Wade, Van | .2007 |
| 'American Majestic Blue' | Large | Unknown | Near-White | - | Wade, Van | --NR-- |
| 'American Monster' | Giant | Hybrid | Near-White | June into July | Wade, Van | --NR-- |
| 'American Pharoah' | Giant | Unknown | - | - | Wade, Van | --NR-- |
| 'American Ruffled Heart' | Giant | Hybrid | Pale-Lavender | June into July | Wade, Van | .2000 |
| 'American Ruffles' | Large | Unknown | Near-White | July | Wade, Van | --NR-- |
| 'American Super Elegans' | Large | Hybrid | Near-White | - | Wade, Van | --NR-- |
| 'American Super Mouse' | Small | Sport | Light-Purple | July | Wade, Van | --NR-- |
| 'American Yeti' | Giant | Hybrid | Near-White | July | Wade, Van | .2007 |
| 'Amethyst Blue' | Medium | Hybrid | Deep-Purple | June into July | Seaver, Charles | .1996 |
| 'Amethyst Chip' | Miniature | Hybrid | Pale-Lavender | July into August | Benedict, Dr Ralph (Herb) & Benedict, Dorothy | .2000 |
| 'Amethyst Facet' | Small | Hybrid | Pale-Lavender | July into August | Benedict, Dr Ralph (Herb) | .2003 |
| 'Amos' | Large | Unknown | Near-White | June into July | Petryszyn, Olga | --NR-- |
| 'Amy Stewart' | Medium | Unknown | - | - | Stark, Gunther | --NR-- |
| 'Andorian' | Small | Unknown | Med-Lavender | - | Dupre, Dirk | .2009 |
| 'Andrew Jackson' | Giant | Unknown | Near-White | June into July | Sugita, Hajime & Ruh, Peter & Ruh, Jean | .2001 |
| 'Andrew's Moody Mom' | Medium | Unknown | - | June into July | Wolfe, A. & Freeman, Franc | .2010 |
| 'Andy' | Medium | Unknown | - | - | Goodwin, Randy | --NR-- |
| 'Angel 13' | Giant | Sport | Near-White | June into July | Unknown | --NR-- |
| 'Ansty' | Medium | Unknown | - | - | Simon, Dr Hans | --NR-- |
| 'Apple Jack' (Benedict) | Medium | Hybrid | - | - | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Aqua Duchess' | Large | Hybrid | - | - | Lydell, Ransom | --NR-- |
| 'Aqua Velva' | Large | Hybrid | Pale-Lavender | July into August | Vaughn, Kevin | .1983 |
| 'Aquamarine' | Medium | Unknown | Med-Lavender | July into August | Gossett, Gary & Terra Nova Nurseries | --NR-- |
| 'Arapaho' | Large | Unknown | - | - | Wade, Van | --NR-- |
| 'Arch Duke' | Giant | Hybrid | Pale-Lavender | July into August | Lydell, Ransom | .2000 |
| 'Arctic Blast' | Medium | Hybrid | Light-Purple | July | Carlson, Monty & Carlson, Julie | .2019 |
| 'Arett's Wonder' | Large | Hybrid | Pale-Lavender | June into July | Arett, Anne & The American Hosta Society | .1986 |
| 'Arten' | Medium | Hybrid | Light-Purple | August | Livingston, Ron | --NR-- |
| 'Asher' | Large | Hybrid | Near-White | July into August | Kwick, Charles | .2017 |
| 'Aspen Blue' | Medium | Sport | Near-White | June into July | Hawes, James | --NR-- |
| 'Astral Bliss' | Small | Hybrid | Pale-Lavender | July into August | Dean, Don | .2009 |
| 'Atomic Elvis Blue' | Medium | Hybrid | Light-Purple | August | Livingston, Ron | --NR-- |
| 'August Blue' | - | Unknown | - | - | Unknown | --NR-- |
| 'Aunt Saphrona' | Medium | Unknown | Near-White | July | Tompkins, Cynthia | --NR-- |
| 'Aventurine' | Medium | Unknown | - | - | Seaver, Mildred | --NR-- |
| 'Awakening Angel' | Medium | Hybrid | Light-Purple | July into August | Nyikos, Frank | .2005 |
| 'Azure Chalice' | Small | Unknown | Pale-Lavender | June into July | Syre-Herz, Ursula | .1996 |
| 'Azure Cherub' | Medium | Unknown | Pale-Lavender | July into August | Ruh, Peter | .2002 |
| 'Azure Frills' | Medium | Hybrid | Light-Purple | July into August | Zilis, Mark | .2010 |
| 'Azure Frost' | Large | Unknown | Near-White | June into July | Treichel, Bernie | .2006 |
| 'Azure Gem' | Small | Hybrid | - | - | Avent, Tony | --NR-- |
| 'Azure Snow' | Large | Hybrid | Pale-Lavender | August to October | Ruh, Peter | .1991 |
| 'Azure Waves' | Medium | Unknown | Med-Lavender | July | Micheletti, Tom | .2011 |
| 'Les Noces d'Argent' | Giant | Unknown | Near-White | June | Bastille, Jocelyne | --NR-- |
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