| Cultivar | Plants in its Genetic Background |
| 'A Scape Plan' | Hosta yingeri, 'Sun Power', 'Elvis Lives', 'Branching Out' (GENETIC BACKGROUND) |
| 'A Step Beyond' | 'Frances Williams' (GENETIC BACKGROUND) |
| 'Abba Soul Mate' | 'Tardiflora', 'Sieboldiana', 'Elegans' (GENETIC BACKGROUND) Tardiana (TYPE) 'Goldbrook Glimmer' (SIMILAR HOSTAS) |
| 'Abiqua Jim Dandy' | Hosta venusta (GENETIC BACKGROUND) 'Abiqua Miniature' (SIMILAR HOSTAS) |
| 'Abiqua Kaleidoscope' | 'Sieboldiana' (GENETIC BACKGROUND) 'Borwick Beauty' (SIMILAR HOSTAS) |
| 'Abiqua Miniature' | Hosta venusta (GENETIC BACKGROUND) 'Abiqua Jim Dandy', 'Tiny Tears' (SIMILAR HOSTAS) |
| 'Abiqua Trumpet' | 'Tokudama' (GENETIC BACKGROUND) 'Abiqua Blue Edger', 'Heart Throb', 'Peter Pan' (SIMILAR HOSTAS) |
| 'Academy Blue Borealis' | 'Sieboldiana' (GENETIC BACKGROUND) 'Elegans' (SIMILAR HOSTAS) |
| 'Academy Blue Titan' | 'Sieboldiana', Hosta montana (GENETIC BACKGROUND) |
| 'Adversary' | 'King's Adversary' (GENETIC BACKGROUND) |
| 'Ah-ha-ha-bah' | 'Sieboldiana' (GENETIC BACKGROUND) |
| 'Ahr' | 'Tardiflora', 'Sieboldiana', 'Elegans' (GENETIC BACKGROUND) Tardiana (TYPE) |
| 'Akarana' | Hosta nakaiana (GENETIC BACKGROUND) |
| 'Alicia' | 'Minuta', Hosta venusta (GENETIC BACKGROUND) |
| 'Allegan Peppermint Twist' | 'Allegan Peppermint' (GENETIC BACKGROUND) |
| 'Alma' | Hosta sieboldii (GENETIC BACKGROUND) 'Subcrocea' (SIMILAR HOSTAS) |
| 'Amber Dietrich' | Hosta sieboldii (GENETIC BACKGROUND) |
| 'American Blue Wrinkles' | 'Wrinkles and Crinkles' (GENETIC BACKGROUND) |
| 'American Gold Canoe' | 'Tardiflora', 'Sieboldiana', 'Elegans' (GENETIC BACKGROUND) Tardiana (TYPE) |
| 'American Gold Cup' | 'Tokudama' (GENETIC BACKGROUND) 'Golden Medallion', 'Golden Teacup' (SIMILAR HOSTAS) |
| 'American Gothic' (Bielstein) | 'Color Fantasy', 'Sea Drift' (GENETIC BACKGROUND) |
| 'American Majestic Blue' | 'Sieboldiana', 'Majestic Blue' (GENETIC BACKGROUND) |
| 'American Pie' | 'Green Fountain', 'Swoosh' (GENETIC BACKGROUND) |
| 'American Ruffled Heart' | 'Sieboldiana' (GENETIC BACKGROUND) |
| 'American Sweetheart Streaked' | 'Miss America' (GENETIC BACKGROUND) |
| 'American Thunderbolt' | 'Thunderbolt' (GENETIC BACKGROUND) |
| 'American Tisch Breeder' | 'Tokudama' (GENETIC BACKGROUND) 'Grandchild', 'Herb Benedict' (SIMILAR HOSTAS) |
| 'Amos' | 'Big John' (GENETIC BACKGROUND) |
| 'Amy Elizabeth' | 'Gold Drop' (GENETIC BACKGROUND) 'Panache', 'Pooh Bear' (SIMILAR HOSTAS) |
| 'Aojiku Iwa Giboshi' | Hosta longipes (GENETIC BACKGROUND) (SOURCE: Hosta Library) |
| 'Apache' | 'Minuteman' (GENETIC BACKGROUND) |
| 'Appetizer' | 'Bright Lights', 'Swoosh', Hosta longissima (GENETIC BACKGROUND) |
| 'Apple Pie' | Hosta montana (GENETIC BACKGROUND) |
| 'Aqua Velva' | 'Blue Lace', 'Polly Bishop' (GENETIC BACKGROUND) 'Sieboldiana' (TYPE) |
| 'August Moonlight' | 'August Moon' (GENETIC BACKGROUND) |
| 'Aunt Margaret's' | Hosta ventricosa (GENETIC BACKGROUND) (SOURCE: MyHosta Database) |
| 'Aurea', H. nigrescens | 'Ogon Kuro' (CORRECT NAME) 'Tenryu', Hosta nigrescens (GENETIC BACKGROUND) |
| 'Autumn Bouquet' | Hosta kikutii (GENETIC BACKGROUND) |
| 'Ava Ann' | 'Tea and Crumpets' (GENETIC BACKGROUND) |
| 'Avalanche' | 'Warwick Choice' (GENETIC BACKGROUND) |
| 'Azure Cherub' | 'Tardiflora', 'Sieboldiana', 'Elegans' (GENETIC BACKGROUND) Tardiana (TYPE) 'Blue Blush' (SIMILAR HOSTAS) |