| Cultivar Name | Source | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Registered |
| 'Jackpot' | Ward, Dr Dick & Jane | Large | Yellow | - | - | Hybrid | Pure-White | July into August | .1996 |
| 'Jade Lancer' | Ruh, Peter | Large | Med-Green | Marginal | Yellow | Unknown | Pale-Lavender | July | .2001 |
| 'James' | Wade, Van | Large | Yellow | - | - | Unknown | - | - | --NR-- |
| 'James Knox Polk' | Ruh, Peter & Jean | Giant | Light-Green | - | - | Unknown | - | - | .2010 |
| 'James River' | Beilstein, Doug & Malloy, Alex | Medium | Med-Green | - | - | Hybrid | Med-Lavender | July into August | .2005 |
| 'Jane Ward' | Ward, Dr Dick & Jane | Medium | Med-Green | Medial | White | Hybrid | Light-Purple | July | .1999 |
| 'Janet's Gold Sox' | Wade, Van | Medium | Yellow | - | - | Nat-Sport | Med-Lavender | July | --NR-- |
| 'Janet's Green Sox' | Wade, Van | Medium | Med-Green | - | - | Nat-Sport | Pale-Lavender | July | --NR-- |
| 'Jan's Gem' | Wade, Van | Medium | Med-Green | - | - | Unknown | - | - | --NR-- |
| 'Jason and Katie' | Hatfield, Handy & Walek, Kevin | Large | Blue/Green | Marginal | Yellow | Nat-Sport | Pale-Lavender | June | .2009 |
| 'Jay Jay' | Grullemans, John J. & Ruh, Peter | Giant | Blue/Green | - | - | Hybrid | Near-White | June into July | .1994 |
| 'Jean Ferris Ruh' | Ruh, Peter & Jean | Medium | Dark-Green | Medial | Yellow | Nat-Sport | Pale-Lavender | July into August | .2005 |
| 'Jeff' | Wade, Van | Large | Blue/Green | - | - | Unknown | Near-White | July | --NR-- |
| 'Jelloway' | Wade, Van | Medium | Light-Green | Marginal | White | Nat-Sport | Pale-Lavender | July | --NR-- |
| 'JenElaine' | Boak, Tim | Large | Dark-Green | Medial | Yellow | Nat-Sport | Med-Lavender | June into July | .2010 |
| 'Jennifer' | Wade, Van | Small | Med-Green | Marginal | Yellow | Unknown | Pale-Lavender | July | .2000 |
| 'Jennifu' | Wade, Van | Small | Med-Green | Marginal | Yellow | Unknown | - | - | --NR-- |
| 'Jerry' | Wade, Van | Large | Yellow | Marginal | Light Green | Unknown | - | - | --NR-- |
| 'Jet Black' | Beilstein, Doug & Mardy | Large | Blue/Green | - | - | Hybrid | Near-White | July | --NR-- |
| 'Jetstream' | Beilstein, Doug & Mardy | Large | Blue/Green | - | - | Hybrid | Pale-Lavender | July into August | .2013 |
| 'Jim Boldt' | Graves, Butch | Large | Blue/Green | - | - | Hybrid | Near-White | July into August | .2017 |
| 'Jiminy Cricket' | Ward, Dr Dick & Jane | Small | Light-Green | Marginal | Yellow | Hybrid | Pale-Lavender | July | .2005 |
| 'Jimmy' | Wade, Van | Small | Med-Green | - | - | Hybrid | - | - | --NR-- |
| 'Jimmy Blue Eyes' | Parsons, Phil | Large | Blue/Green | - | - | Unknown | - | June into July | .2012 |
| 'Joan Altman' | Kuk, Bob | Small | Light-Green | Marginal | Yellow | Unknown | Pale-Lavender | July into August | .2011 |
| 'Johanne' | Ellyson, Craig & Ruh, Peter | Medium | Blue/Green | - | - | Hybrid | Near-White | June into July | .1989 |
| 'John Q. Adams' | Ruh, Peter & Jean | Giant | Yellow | - | - | Unknown | Pale-Lavender | July | .2003 |
| 'John Tyler' | Ruh, Peter & Zilis, Mark | Large | Blue/Green | - | - | Unknown | Light-Purple | July | .2011 |
| 'Jon's Gem' | Hatfield, Handy | Medium | Light-Green | - | - | Unknown | - | July into August | .2009 |
| 'Joseph' | Kuk, Bob | Large | Dark-Green | - | - | Nat-Sport | Light-Purple | July into August | .1990 |
| 'Josephine' | Kuk, Bob | Medium | Blue/Green | Marginal | White | Hybrid | Light-Purple | July into August | .1987 |
| 'Joyce Lane' | Graves, Butch | Large | Dark-Green | Marginal | Yellow | Hybrid | Pale-Lavender | July into August | .2017 |
| 'Joyland' | Beilstein, Doug & Malloy, Alex | Small | Med-Green | Streaked | Speckles | Hybrid | - | - | --NR-- |
| 'Jubilee' | Ward, Dr Dick & Jane | Medium | Med-Green | Marginal | Yellow | Hybrid | Pale-Lavender | July into August | .2009 |
| 'Judi's Joy' | Frost, Judi | Medium | Med-Green | Streaked | White | Nat-Sport | Med-Lavender | July into August | .2003 |
| 'Julia' | White, Peter | Large | Dark-Green | Marginal | White | Nat-Sport | Pale-Lavender | July into August | .1984 |
| 'Jumbo' | Meissner, O. & Ruh, Peter | Giant | Blue/Green | - | - | Hybrid | Near-White | June into July | .1997 |
| 'June Beauty' | Wayside Gardens & AHS | Large | Blue/Green | - | - | Unknown | Near-White | June into July | .1986 |
| 'Jungle Fever' | Ward, Dr Dick & Jane | Medium | Yellow | Streaked | White | Hybrid | Pale-Lavender | June | .2013 |
| 'Just for Jane' | Ward, Dr Dick & Jane | Medium | Dark-Green | Marginal | Yellow | Hybrid | - | - | .2011 |
| 'Just So Green' | Wade, Van | Small | Med-Green | - | - | Nat-Sport | Pale-Lavender | June into July | --NR-- |
|