| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Ain't Misbehavin' | Medium | Med-Green | | - | Hybrid | Med-Lavender | August to October | Dalton, Jim & Meg | .2012 |
| 'Don't Look Back' | Small | Med-Green | Streaked | Yellow | Hybrid | Near-White | June into July | Ward, Dr Dick & Jane | .2015 |
| 'Don't Touch My Junk' | Small | Med-Green | Streaked | Yellow | Unknown | - | June into July | Freeman, Franc | .2011 |
| 'Kiss Me Kwick and Don't Slobber' | Large | Light-Green | | - | Hybrid | Near-White | June into July | Kwick, Charles | .2017 |
| 'She Don't Know She's Beautiful' | Large | Yellow | | - | Unknown | - | June into July | Kwick, Charles | .2016 |
| 'Taj Mahal' | Large | Med-Green | Medial | White | Hybrid | Near-White | June into July | Ward, Dr Dick & Jane | .2009 |
| 'Tangerine' | Medium | Yellow | | - | Hybrid | Pale-Lavender | July | Elslager, Ed | .1998 |
| 'Tango Twist' | Large | Med-Green | Medial | Yellow | Nat-Sport | - | June into July | Silvers, Bill | .2012 |
| 'Taurus' | Large | Blue/Green | | - | Hybrid | Near-White | June into July | Husemann, Jim | .2009 |
| 'Teacher's Pet' | Medium | Blue/Green | Marginal | White | Hybrid | Near-White | June into July | Asch, Stuart | .2000 |
| 'Temple of Heaven' | Small | Med-Green | Medial | White | Hybrid | - | - | Ward, Dr Dick & Jane | .2012 |
| 'The Big Five-oh' | Giant | Dark-Green | | - | Unknown | Near-White | June into July | Seaver, Charles | .2017 |
| 'The Green Hornet' | Large | Med-Green | Streaked | Yellow | Hybrid | Pale-Lavender | July | Elslager, Ed | .2004 |
| 'The Leading Edge' | Giant | Med-Green | Marginal | Yellow | Hybrid | Pale-Lavender | June into July | Elslager, Ed | .2002 |
| 'The Sun King' | Large | Yellow | | - | Unknown | Near-White | July | O'Harra, Russ | .1999 |
| 'The Wall' | Giant | Blue/Green | | - | Unknown | Near-White | July into August | Schulz, Ed | .2017 |
| 'Thelonius' | Medium | Blue/Green | | - | Hybrid | Near-White | July into August | Ward, Dr Dick & Jane | .2009 |
| 'Then' | - | Dark-Green | Marginal | White | Nat-Sport | - | - | Benedict, Dr R. (Herb) & Dorothy & Kuenster, Rod | .2010 |
| 'Theodore Roosevelt' | Large | Light-Green | | - | Unknown | Pale-Lavender | June into July | Sugita, Hajime & Ruh, Peter | .2001 |
| 'Thriller' | - | Blue/Green | Streaked | Speckles | Unknown | - | July into August | Mullin, Joy & Schwarz, Jim | .2015 |
| 'Time Tunnel' | Medium | Blue/Green | Marginal | Yellow | TC Sport | Near-White | June into July | Laviana, Marc & Malloy, Alex | .2001 |
| 'Timothy C. Morgan' | Medium | Blue/Green | Medial | White | Unknown | Pale-Lavender | July into August | Chamberlain, Steve | .2005 |
| 'Timothy J. Wright' | Medium | Yellow | | - | Unknown | Med-Lavender | - | Chamberlain, Steve | .2015 |
| 'To Dye For' | Large | Light-Green | Medial | White | Unknown | Near-White | July | Dye, Kay | .2017 |
| 'Tokudama American Green' | Medium | Dark-Green | | - | Hybrid | - | - | Wade, Van | --NR-- |
| 'Tokudama Flavoplanata' | Medium | Blue/Green | Medial | Yellow | Nat-Sport | Near-White | June into July | Maekawa, Dr Fumio & AHS | .1987 |
| 'Too Darn Hot' | Medium | Yellow | | - | Hybrid | Near-White | July | Ward, Dr Dick & Jane | .2009 |
| 'Top Dog' | Medium | Yellow | | - | Hybrid | - | June into July | Ward, Dr Dick & Jane | .2009 |
| 'Top Hat and Tails' | Giant | Blue/Green | Streaked | Yellow | Hybrid | Med-Lavender | June into July | Elslager, Ed | .2005 |
| 'Topsy-turvy' | Medium | Dark-Green | Streaked | White | Hybrid | Pale-Lavender | July | Elslager, Ed | .2000 |
| 'Tossed Salad' | Large | Dark-Green | | - | Hybrid | - | July into August | Vaughn, Kevin & Walek, Kevin | .2009 |
| 'Toto' | Small | Med-Green | Marginal | White | Hybrid | - | July into August | Ward, Dr Dick & Jane | .2009 |
| 'Toutatis' | Small | Yellow | | - | Unknown | - | June into July | Deckert, Emile & Jane | .2004 |
| 'Towering Inferno Remembered' | Large | Blue/Green | Streaked | Yellow | Hybrid | Pale-Lavender | June into July | Elslager, Ed | .2001 |
| 'Toyo-no-omoide' | Large | Med-Green | | - | Hybrid | Near-White | July | Nakayama, Toyozo & Lockwood, Mikky | .2018 |
| 'Transformer' | - | Dark-Green | Medial | White | Unknown | - | - | Beilstein, Doug & Mardy | .2009 |
| 'Transitions' | Large | Med-Green | Marginal | Yellow | Unknown | Med-Lavender | July into August | Dean, Don | .2016 |
| 'Triangulation' | Small | Med-Green | Marginal | White | Hybrid | Med-Lavender | June into July | Avent, Tony | .2012 |
| 'Trilogy' | Medium | Med-Green | Medial | Blue-Green | Hybrid | Pale-Lavender | June | Gilligan, Madelon | .2018 |
| 'Tropic Thunder' | Medium | Med-Green | Marginal | Yellow | Hybrid | - | - | Ward, Dr Dick & Jane | .2012 |
| 'True Heart' | Giant | Blue/Green | | - | Unknown | - | June into August | Schulz, Ed | .2013 |
| 'Tuff Howard' | Medium | Dark-Green | | - | Unknown | - | June into July | Freeman, Franc | .2010 |
| 'Turner Junction' | Large | Blue/Green | | - | TC Sport | Near-White | June into July | Zilis, Mark | .2003 |
| 'Typhoon' | Large | Med-Green | Marginal | Yellow | Nat-Sport | - | June into July | Ward, Dr Dick & Jane | .2010 |
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