| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Candy Dish' (Hawes) | Large | Dark-Green | - | - | Hybrid | Pale-Lavender | August to October | Hawes, James | .2003 |
| 'Candy Dish' (Summers) | Medium | Med-Green | | - | Hybrid | Pale-Lavender | August to September | Summers, Alex & Wrede, Arthur | .2003 |
| 'Candy Kisses' | Medium | Med-Green | - | - | Hybrid | Med-Lavender | August to October | Solberg, Robert & Shades of Green | .2013 |
| 'Cauduca Saigoku' | Small | Med-Green | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Cedar River' | Large | Dark-Green | - | - | Unknown | - | - | Malloy, Alex | --NR-- |
| 'Celtic Dancer' | Medium | Med-Green | - | - | Hybrid | Pale-Lavender | July into August | Dean, Don | .2008 |
| 'Cemetery Road' | Large | Med-Green | Streaked | White | Hybrid | Light-Purple | August to September | Kuenster, Rod | .2011 |
| 'Chariots of Fire' | Medium | Light-Green | Marginal | Yellow | Hybrid | Light-Purple | August to October | Dishon, Jim | .2004 |
| 'Chartreuse Fountain' | Medium | Yellow | - | - | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Cheery Charley' | Miniature | Light-Green | Marginal | White | Sport | Light-Purple | August | Green Mountain Hosta | --NR-- |
| 'Cherries a la Mode' | Small | Yellow | Marginal | White | Sport | Med-Lavender | June into July | Vasey, Mike | .2017 |
| 'Cherry Flip' | Medium | Dark-Green | - | - | Hybrid | Light-Purple | August | Zilis, Mark & Solberg, Robert | .2012 |
| 'Cherry Garcia' | - | - | - | - | Unknown | - | - | Herold, Roy | --NR-- |
| 'Cherry Red' | Medium | Dark-Green | | | Unknown | | | Van Eechaute, Danny | --NR-- |
| 'Chichibu Genso Iwa' | Medium | Med-Green | Streaked | White | Sport | - | - | Kosasa | --NR-- |
| 'Childhood Sweetheart' | Medium | Light-Green | Marginal | White | Hybrid | Pale-Lavender | August | Hansen, Hans | .2005 |
| 'China Girl' | Small | Med-Green | - | - | Hybrid | Pale-Lavender | - | Scheer, Alttara | --NR-- |
| 'Chopsticks' | Medium | Med-Green | - | - | Hybrid | Light-Purple | September to October | Herold, Roy & Walek, Kevin | .2009 |
| 'Chris' China Star' | Medium | Light-Green | - | - | Hybrid | - | - | Brinkmann, Christina | --NR-- |
| 'Chris' Darkest Purple' | Medium | Light-Green | | | Hybrid | Deep-Purple | August to September | Brinkmann, Christina | --NR-- |
| 'Chris' Little Watermelon' | Small | Med-Green | | | Nat-Sport | Pale-Lavender | | Brinkmann, Christina | --NR-- |
| 'Chris' Red Lightning' | Medium | Med-Green | | | Hybrid | | | Brinkmann, Christina | --NR-- |
| 'Chris' Small Talk' | Small | Med-Green | Marginal | Yellow | Nat-Sport | Pale-Lavender | | Brinkmann, Christina | --NR-- |
| 'Chris’ Tropical Sundown' | Medium | Yellow | | | Hybrid | Med-Lavender | August to September | Brinkmann, Christina | --NR-- |
| 'Cinnamon and Sugar' | Medium | Med-Green | - | - | Unknown | - | - | Herold, Roy | --NR-- |
| 'Cinnamon Bun' | Miniature | Med-Green | - | - | Unknown | - | - | Herold, Roy | --NR-- |
| 'Cinnamon Sticks' | Medium | Med-Green | - | - | Hybrid | Light-Purple | August to October | Herold, Roy & Walek, Kevin | .2009 |
| 'Cinnamon Twist' | Medium | Med-Green | - | - | Unknown | - | - | Herold, Roy | --NR-- |
| 'City Dog' | Medium | Med-Green | Marginal | White | Sport | Pale-Lavender | June into July | Van Eechaute, Danny | .2014 |
| 'Clementine' | Small | Med-Green | - | - | Hybrid | Pale-Lavender | July | Husemann, Jim & Schulz, Ed | .2007 |
| 'Coach Jim Fox' | Medium | Dark-Green | Streaked | White | Hybrid | - | July into August | Freeman, Franc | .2009 |
| 'Coconut Custard' | Miniature | Yellow | - | - | Hybrid | Med-Lavender | July into August | Solberg, Robert | .2007 |
| 'Code Red' | Small | Yellow | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Colored Muffin' | Medium | Blue/Green | Streaked | Yellow | Nat-Sport | Deep-Purple | July | Van den Top, Jan | --NR-- |
| 'Colors in Motion' | Giant | Blue/Green | Streaked | White | Hybrid | Pale-Lavender | June into July | de Rooij, Piet | .2014 |
| 'Condor' | Small | Med-Green | - | - | Hybrid | Light-Purple | August to October | Sugita, Hajime & Ruh, Peter | .2002 |
| 'Contorted Dragon' | Large | Blue/Green | - | - | Hybrid | - | - | Livingston, Ron | --NR-- |
| 'Cooltini' | Small | Blue/Green | - | - | Hybrid | Light-Purple | August to September | Zilis, Mark | .2009 |
| 'Corkscrew' | Small | Med-Green | - | - | Hybrid | Light-Purple | August to October | Solberg, Robert | .2003 |
| 'Cosmic Confetti' | Large | Blue/Green | Streaked | Yellow | Hybrid | Near-White | June into July | Kuenster, Rod | .2019 |
| 'Cosmic Eye Candy' | Medium | Med-Green | Streaked | Yellow | Hybrid | Pale-Lavender | June into July | Kuenster, Rod | .2014 |
| 'Cosmic Hot Mama' | Large | Med-Green | Streaked | White | Hybrid | Near-White | June into July | Kuenster, Rod | .2011 |
| 'Cosmic Jazzy' | Large | Light-Green | Streaked | White | Hybrid | Pale-Lavender | July into August | Kuenster, Rod | .2019 |
| 'Cosmic Mad Scientist' | Large | Blue/Green | Streaked | Yellow | Hybrid | Near-White | - | Kuenster, Rod | .2012 |
| 'Cosmic Moonshine' | Large | Blue/Green | Streaked | Yellow | Hybrid | Med-Lavender | June into July | Kuenster, Rod | .2012 |
| 'Cosmic Paint Shaker' | Large | Blue/Green | Streaked | Yellow | Hybrid | Near-White | June into July | Kuenster, Rod | .2012 |
| 'Cosmic Pistol' | Medium | Light-Green | Streaked | White | Hybrid | Near-White | July | Kuenster, Rod | .2012 |
| 'Cosmic Rain' | Large | Blue/Green | Streaked | Yellow | Hybrid | Pale-Lavender | August | Kuenster, Rod | .2013 |
| 'Cosmic River' | Medium | Med-Green | Streaked | Yellow | Hybrid | Med-Lavender | July into August | Kuenster, Rod | .2011 |
| 'Cosmic Secret' | Medium | Blue/Green | Streaked | Yellow | Hybrid | Near-White | July into August | Kuenster, Rod | .2013 |
| 'Cosmic Smiles' | Large | Blue/Green | Streaked | Yellow | Hybrid | Med-Lavender | June into July | Kuenster, Rod | .2012 |
| 'Cranberries and Cream' | Small | Dark-Green | Streaked | White | Unknown | - | - | Silvers, Bill | --NR-- |
| 'Cranberry Wine' | Small | Light-Green | - | - | Hybrid | - | - | Sisson, Kathie | --NR-- |
| 'Crazy Hazy' | Medium | Blue/Green | Marginal | Yellow | Sport | Med-Lavender | - | Fransen, Marco & Fransen, Joyce | --NR-- |
| 'Crazy Spirit' | Medium | Med-Green | Streaked | Yellow | Sport | Pale-Lavender | August | Van Eechaute, Danny | --NR-- |
| 'Crickett's Mountain Mist' | Large | Blue/Green | Streaked | White | Sport | Pale-Lavender | July into August | Bailey, Crickett | .2017 |
| 'Crimson Desire' | Medium | Dark-Green | - | - | Hybrid | Med-Lavender | August | Dean, Don | .2017 |
| 'Crumb Cake' | Small | Dark-Green | - | - | Hybrid | Light-Purple | July | Solberg, Robert | .2008 |
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