| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Caesar Augustus' | Small | Med-Green | Medial | White | Nat-Sport | Med-Lavender | June into July | Ward, Dr Dick & Jane | .2015 |
| 'Carmen Ohio' | Small | Med-Green | Marginal | White | Hybrid | Near-White | June into July | Ward, Dr Dick & Jane | .2015 |
| 'Champagne for All' | Medium | Dark-Green | Medial | White | Nat-Sport | Pale-Lavender | July into August | Van Eechaute, Danny | .2015 |
| 'Cheese Louise' | Large | Light-Green | - | - | Unknown | - | - | Hackbarth, Robert | .2015 |
| 'Coach Millboy Miller' | Medium | Dark-Green | - | - | Unknown | - | July into August | Schwarz, Jim | .2015 |
| 'Colesburg Sonny Boy' | Large | Dark-Green | Medial | Yellow | Nat-Sport | Pale-Lavender | July into August | Hackbarth, Robert | .2015 |
| 'Colesburg Wiggles' | Medium | Med-Green | Marginal | Yellow | Unknown | Light-Purple | July into August | Hackbarth, Robert | .2015 |
| 'Compadre' | Medium | Dark-Green | Medial | Yellow | Nat-Sport | Light-Purple | July into August | Ritchey, Allen | .2015 |
| 'Congratulations' | Large | Dark-Green | Medial | White | Hybrid | Near-White | July | Johnson, Ross | .2015 |
| 'Cosmic Knuckles' | Giant | Dark-Green | - | - | Hybrid | Near-White | July into August | Kuenster, Rod | .2015 |
| 'Cosmic Moon' | Large | Blue/Green | - | - | Hybrid | Near-White | July into August | Kuenster, Rod | .2015 |
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