| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Registered |
| 'Ragtime' | Large | Yellow | - | - | Hybrid | Pale-Lavender | June into July | .2013 |
| 'Rainmaker' | Giant | Med-Green | - | - | Unknown | - | June into July | .2009 |
| 'Rainy Day' | Medium | Med-Green | Medial | White | Hybrid | Pale-Lavender | June into July | .2014 |
| 'Riding High' | Giant | Dark-Green | - | - | Unknown | - | June into July | .2014 |
| 'River of Gold' | Large | Yellow | - | - | Unknown | - | June into July | .2014 |
| 'Rock of Ages' | Giant | Blue/Green | - | - | Sport | Pure-White | June into July | .2009 |
| 'Rocky Fork' | Medium | Blue/Green | - | - | Unknown | Pale-Lavender | June into July | .2003 |
| 'Ruby Slippers' | Medium | Med-Green | - | - | Hybrid | Light-Purple | September | .1999 |
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