| No. | Cultivar Name | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
|
1
| 'Cabin Boy' | Light-Green | - | - | Hybrid | Light-Purple | July into August | Kwick, Charles | .2017 |
|
2
| 'Cadillac' | Yellow | Marginal | Blue-Green | Unknown | Near-White | July | Skrocki, Ed & Avent, Tony | .1998 |
|
3
| 'Carol Marie' | Light-Green | - | - | Hybrid | - | June into July | Kwick, Charles | .2016 |
|
4
| 'Catherine the Great' | Light-Green | - | - | Unknown | Pale-Lavender | July into August | Goodwin, Randy | .2019 |
|
5
| 'Celadon Rainbow' | Blue/Green | Medial | White | Unknown | Med-Lavender | July into August | Dye, Kay | .2020 |
|
6
| 'Child of the Queen' | Blue/Green | Medial | Yellow | Sport | - | - | Van den Top, Jan | --NR-- |
|
7
| 'Christmas Tree Gala' | Dark-Green | Streaked | Yellow | Sport | Med-Lavender | July | Powell, Loleta | .2000 |
|
8
| 'Color Riot' | Med-Green | Medial | White | Hybrid | Pale-Lavender | June into July | Tompkins, Chet & Tompkins, Cynthia & Ruh, Peter | .2010 |
|
9
| 'Corkscrew' | Med-Green | - | - | Hybrid | Light-Purple | August to October | Solberg, Robert | .2003 |
|
10
| 'Cosmopolitain' | Med-Green | Marginal | White | Hybrid | Near-White | - | Bastille, Jocelyne | --NR-- |
|
11
| 'Cotton Candy' | Med-Green | Streaked | Speckles | Sport | Med-Lavender | July into August | Zilis, Mark | .2009 |
|
12
| 'Creek' | Blue/Green | - | - | Hybrid | Pure-White | June | Wade, Van | .2007 |
|
13
| 'Crinkles' | Yellow | - | - | Hybrid | Pure-White | June into July | Goodwin, Randy | .2009 |
|
14
| 'Crossing the Rubicon' | Yellow | - | - | TC Sport | - | June into July | Zilis, Mark | .2009 |
|