| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Jammin' | Medium | Dark-Green | Streaked | White | Hybrid | - | July into August | Zilis, Mark | .2010 |
| 'Janie Girl' | Large | Dark-Green | Medial | Yellow | Hybrid | Med-Lavender | July into August | Hanna, Clarence | .2020 |
| 'Jarett H Park' | Large | Dark-Green | - | - | Hybrid | Near-White | July into August | Chamberlain, Steve | .2003 |
| 'Jay B. Abendroth' | Large | Blue/Green | - | - | Hybrid | Near-White | July into August | Chamberlain, Steve | .2001 |
| 'Jazzy Jane' | Medium | Med-Green | Streaked | White | Sport | Light-Purple | July | Unknown | --NR-- |
| 'JenElaine' | Large | Dark-Green | Medial | Yellow | Sport | Med-Lavender | June into July | Boak, Tim | .2010 |
| 'Joan's Alter Ego' | Medium | Yellow-Gold | | - | Sport | Pale-Lavender | July | Bowe, Dave | .2020 |
| 'John Diamond' | Medium | Dark-Green | - | - | Unknown | - | June into August | Zolock, Steve & Zolock, Sarah | .2009 |
| 'John James' | Large | Dark-Green | - | - | Unknown | Pure-White | July into August | Zolock, Steve & Zolock, Sarah | .2007 |
| 'John Kulpa' | Medium | Dark-Green | Medial | Yellow | Sport | Near-White | July into August | Kulpa, John | .1999 |
| 'John Q. Adams' | Giant | Yellow | - | - | Hybrid | Pale-Lavender | July | Ruh, Peter & Ruh, Jean | .2003 |
| 'Jordan's Heart' | Giant | Dark-Green | Marginal | White | Unknown | Med-Lavender | July into August | Foughty, C. & Asch, Stuart | .2011 |
| 'Jujen' | Large | Yellow | Marginal | White | Sport | Med-Lavender | June into July | Jones, Leonard | .2002 |
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