| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Caliban' | Giant | Yellow | Marginal | Green | Sport | Med-Lavender | July to August | Scolnik, Patricia & Walek, Kevin & The American Hosta Society | .2009 |
| 'Canadian Blue' | Large | Blue/Green | | | Unknown | Pale-Lavender | July to August | Van Vliet, Arie & Walek, Kevin & The American Hosta Society | .2009 |
| 'Candelabra' | Small | Blue/Green | | | Unknown | Light-Purple | July to August | Benedict, Dr Ralph (Herb) & Walek, Kevin & The American Hosta Society | .2009 |
| 'Carriage Wheels' | Medium | Dark-Green | Medial | Yellow | Sport | Near-White | June to July | Summers, Alex & Walek, Kevin & The American Hosta Society | .2009 |
| 'Cascade Mist' | Small | Dark-Green | Marginal | White | Unknown | Unknown | Unknown | Walden West Nursery & Walek, Kevin & The American Hosta Society | .2009 |
| 'Chances Are' | Giant | Blue/Green | | | Unknown | Near-White | June to July | Tompkins, Chet & Walek, Kevin & The American Hosta Society | .2009 |
| 'Checkerboard II' | Large | Med-Green | | | Unknown | Pale-Lavender | July | Unknown & Walek, Kevin & The American Hosta Society | .2009 .2018 |
| 'Chinese Gold' | Medium | Yellow | | | Hybrid | Unknown | August to September | Wade, Van & Walek, Kevin & The American Hosta Society | .2009 |
| 'Chopsticks' | Medium | Med-Green | | | Hybrid | Light-Purple | September to October | Herold, Roy & Walek, Kevin & The American Hosta Society | .2009 |
| 'Christmas Gold' | Large | Yellow | | | Sport | Pale-Lavender | July | Seaver, Mildred & Walek, Kevin & The American Hosta Society | .2009 |
| 'Cinnamon Sticks' | Medium | Med-Green | | | Hybrid | Light-Purple | August to September to October | Herold, Roy & Walek, Kevin & The American Hosta Society | .2009 |
| 'Circle of Light' | Small | Med-Green | Marginal | White | Hybrid | Pale-Lavender | July to August | Walek, Kevin | .1996 |
| 'Claudia' | Medium | Med-Green | | | Hybrid | Light-Purple | July to August | Grenfell, Diana & Walek, Kevin & The American Hosta Society | .2009 |
| 'Clokei' | Small | Dark-Green | Marginal | White | Unknown | Unknown | Unknown | Viette, Andre & Walek, Kevin & The American Hosta Society | .2009 |
| 'Collector's Choice' | Small | Med-Green | | | Unknown | Light-Purple | July | Janssen, Bill & Walek, Kevin & The American Hosta Society | .2009 |
| 'Columbus Circle' | Large | Med-Green | Marginal | Creamy White | Hybrid | Pale-Lavender | July to August | Santa Lucia, Vic & Walek, Kevin & The American Hosta Society | .2009 |