| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'A Dog of Flanders' | Medium | Med-Green | - | - | Hybrid | - | - | Philips, Hugo | .2010 |
| 'A Passion For Purple' | Medium | Med-Green | - | - | Unknown | Deep-Purple | - | Lysne, Rod | .2019 |
| 'Abana' | Medium | Dark-Green | Medial | Yellow | Sport | - | July into August | Dupre, Dirk | .2010 |
| 'Abba Loops' | Medium | Med-Green | - | - | Unknown | - | - | Aden, Paul | --NR-- |
| 'Abba Redskin' | Medium | Light-Green | Marginal | White | Unknown | - | - | Aden, Paul | --NR-- |
| 'Abba Sombrero' | Medium | Med-Green | Medial | Yellow | Unknown | - | - | Aden, Paul | --NR-- |
| 'Abiqua Chelais' | Medium | Med-Green | - | - | Unknown | - | - | Purtymun, Charles | --NR-- |
| 'Academy Cratered Blue' | Giant | Blue/Green | - | - | Unknown | Near-White | July | Chamberlain, Steve | .2008 |
| 'Academy Rivendell' | Large | Med-Green | - | - | Hybrid | Med-Lavender | July into August | Chamberlain, Steve | .2005 |
| 'Academy Subtle Sally' | Small | Med-Green | Marginal | White | Unknown | Near-White | July | Chamberlain, Steve | .2015 |
| 'Admiral Eve' | Medium | Blue/Green | | | Unknown | | | Moore, Jeff | --NR-- |
| 'Akane' | Medium | Dark-Green | - | - | Unknown | Light-Purple | August to September | Watanabe, Kenji & Hawes, James & Ruh, Peter & Ruh, Jean | .2010 |
| 'Allo, Allo, Allo' | Medium | Med-Green | - | - | Hybrid | Med-Lavender | July into August | Scheer, Alttara & Gilligan, Madelon | .2017 |
| 'Alma' | Small | Yellow | - | - | Unknown | Light-Purple | August | Krossa, Gus & Ruh, Peter | .1995 |
| 'Almost' | Medium | Green | - | - | Hybrid | Light-Purple | August to October | Wrede, Arthur | .2005 |
| 'Almost Paradise' | Small | Med-Green | Streaked | Yellow | Nat-Sport | | September to October | Fransen, Marco & Fransen, Joyce | --NR-- |
| 'Almost Unreal' | Small | Med-Green | | | Unknown | | | Van Eechaute, Danny | --NR-- |
| 'Amazone' | Medium | Dark-Green | Medial | White | Sport | Med-Lavender | July into August | Heemskerk, Gerardus | .2018 |
| 'Ambrosia' | Large | Blue/Green | Medial | Yellow | Sport | Pale-Lavender | July into August | Solberg, Robert | .2016 |
| 'Amethyst Joy' | Medium | Med-Green | - | - | Hybrid | - | July into August | Sugita, Hajime & Ruh, Peter | .1999 .2000 |
| 'Anaconda' | Medium | Light-Green | - | - | Hybrid | Pale-Lavender | July into August | Scheer, Alttara & Gilligan, Madelon | .2015 |
| 'Annabel Lee' | Medium | Yellow | - | - | Unknown | Med-Lavender | July | Scheer, Alttara & The American Hosta Society | .2019 |
| 'Apostel' | Medium | Med-Green | | - | Hybrid | Deep-Purple | July into August | Ragus, Gerhard & Ragus, Renate | .2020 |
| 'Apple Cobbler' | Small | Med-Green | Streaked | White | Unknown | - | - | Malloy, Alex | --NR-- |
| 'Applique' | Small | Med-Green | Marginal | White | Unknown | Near-White | July into August | Jones, C.L. | .2016 |
| 'Armani' | Large | Dark-Green | - | - | Hybrid | - | July into August | Van Eechaute, Danny | .2015 |
| 'Artisan Voodoo Spell' | Medium | Blue/Green | | | Hybrid | Deep-Purple | August | Smith, S.D. | .2022 |
| 'Artrishia' | Small | Yellow | - | - | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Atomic Dragon' | Small | Light-Green | - | - | Hybrid | - | August | Livingston, Ron | --NR-- |
| 'Audrey's Island' | Medium | Light-Green | Medial | Yellow | Sport | - | June into July | Moore, Betty | .2016 |
| 'Autumn Fire' | Large | Yellow | - | - | Unknown | - | - | Duncan, Mary Jo | .2014 |
| 'Autumn Ridge' | Medium | Med-Green | Marginal | White | Unknown | Med-Lavender | August | Goodwin, Randy | .2009 |
| 'Avocado Toast' | Small | Dark-Green | Marginal | Yellow | Sport | Light-Purple | July into August | Solberg, Robert | .2020 |
| 'Azuretini' | Small | Med-Green | - | - | Hybrid | - | August to October | Zilis, Mark | .2009 |
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