| 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 & Dalton, Meg | .2012 |
| 'T Dawg' | Large | Med-Green | Medial | White | TC Sport | Pale-Lavender | July into August | Stark, Dean | --NR-- |
| 'T N T' | Medium | Dark-Green | Medial | Yellow | Sport | Pale-Lavender | July into August | Zilis, Mark | .2010 |
| 'Taj Mahal' | Large | Med-Green | Medial | White | Hybrid | Near-White | June into July | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Tamiami Blue' | Large | Blue/Green | - | - | Hybrid | Near-White | July into August | Smith, Roger | .2013 |
| 'Tangerine Tango' | Medium | Blue/Green | Medial | Yellow | TC Sport | Pale-Lavender | July into August | Sebright Gardens | .2013 |
| 'Tardiflora' | Small | Med-Green | - | - | Hybrid | Pure-White | September to October | Unknown | --NR-- |
| 'Tassels' | Large | Yellow | Streaked | Speckles | Sport | Pale-Lavender | July into August | Whitmore, Bob | .2002 |
| 'Tattle Tails' | Miniature | Med-Green | Marginal | Yellow | Sport | Med-Lavender | July | Fransen, Marco | --NR-- |
| 'Tawny' | Small | Yellow | - | - | Unknown | - | - | Lydell, Ransom | --NR-- |
| 'Teacher's Pet' | Medium | Blue/Green | Marginal | White | Hybrid | Near-White | June into July | Asch, Stuart | .2000 |
| 'Tears of Joy' | Miniature | Light-Green | - | - | Sport | Light-Purple | June into July | Black, Paul & Johnson, Thomas & Sebright Gardens | .2005 |
| 'Temple Great' | Large | Blue/Green | - | - | Hybrid | Pale-Lavender | July | Jernigan, Bettie | .1986 |
| 'Ten Karat Gold' | Medium | Yellow | - | - | Hybrid | - | - | Zilis, Mark & Ruh, Peter & Ruh, Jean | .2008 |
| 'Tenryu Nishiki' | Large | Med-Green | Marginal | Yellow | Hybrid | Light-Purple | September | Unknown & Walek, Kevin | .2009 .2018 |
| 'Terre Haute' | Small | Med-Green | - | - | Unknown | - | July | Goodwin, Randy | .2009 |
| 'The Ambassador' | Small | Med-Green | Marginal | White | Unknown | - | - | Goodwin, Randy | .2013 |
| 'The Big Easy' | Medium | Dark-Green | Marginal | Green | TC Sport | - | July into August | Zilis, Mark & Cunningham, L. | .2009 |
| 'The Devil's Edge' | Medium | Dark-Green | Marginal | Green | TC Sport | - | July into August | Zilis, Mark | .2009 |
| 'The Gambler' | Large | Yellow | - | - | Sport | Pale-Lavender | July into August | Zilis, Mark & Schwarz, Karen | .2014 |
| 'The Gathering' | Large | Blue/Green | - | - | Sport | Near-White | June into July | Zilis, Mark & Schwarz, Karen | .2014 |
| 'The General' | Large | Med-Green | - | - | Unknown | Med-Lavender | - | Savory, Dennis | .2012 |
| 'The High Life' | Medium | Yellow | Marginal | Green | TC Sport | Pale-Lavender | July into August | Barta, Jack & Micheletti, Tom & Zilis, Mark | .2012 |
| 'The Sun King' | Large | Yellow | - | - | Unknown | Near-White | July | O'Harra, Russ | .1999 |
| 'Thelma M. Pierson' | Large | Yellow | - | - | Sport | Light-Purple | June into July | Pierson, Robert | .1988 |
| 'Thelonius' | Medium | Blue/Green | - | - | Hybrid | Near-White | July into August | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Then' | - | Dark-Green | Marginal | White | Sport | - | - | Benedict, Dr Ralph (Herb) & Kuenster, Rod | .2010 |
| 'Thrills and Frills' | Small | Med-Green | Marginal | Yellow | Hybrid | Pale-Lavender | July | Dean, Don | .2012 |
| 'Tigger' | Medium | Dark-Green | Streaked | Yellow | Hybrid | Pale-Lavender | June into July | Simmering, Ron | .2000 |
| 'Tilt-A-Whirl' | Medium | Blue/Green | - | - | Hybrid | Pale-Lavender | August to September | Solberg, Robert | .2013 |
| 'Timber Blaze' | Medium | Yellow | - | - | Unknown | Med-Lavender | - | Hackbarth, Robert | .2015 |
| 'Timeless Treasure' | Giant | Med-Green | - | - | Hybrid | Near-White | June into July | Shadrack, Mike | .2011 |
| 'Timothy C. Morgan' | Medium | Blue/Green | Medial | White | Unknown | Pale-Lavender | July into August | Chamberlain, Steve | .2005 |
| 'Tiny Bubbles' | Small | Light-Green | - | - | Hybrid | Pale-Lavender | July into August | Solberg, Robert | .2008 |
| 'Tips Up' | Medium | Med-Green | - | - | Unknown | - | - | Janssen, Bill | --NR-- |
| 'Tobacco Road' | - | Yellow | Marginal | Green | Hybrid | - | June into July | Petryszyn, Olga | .2010 |
| 'Tokushima Aiyagawa' | Small | Med-Green | Streaked | Yellow | Unknown | - | - | Unknown | --NR-- |
| 'Tonoko Tachi' | Medium | Med-Green | - | - | Sport | Light-Purple | July into August | Maekawa, Dr Fumio | --NR-- |
| 'Too Darn Hot' | Medium | Yellow | - | - | Hybrid | Near-White | July | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Top Brass' | Giant | Yellow | - | - | Hybrid | Med-Lavender | June into July | Gilligan, Madelon | .2013 |
| 'Top Dog' | Medium | Yellow | - | - | Hybrid | - | June into July | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Top of Mount Fuji' | Large | Med-Green | - | - | TC Sport | Pale-Lavender | July | Fransen, Marco & Fransen, Joyce | --NR-- |
| 'Topo Gigio' | Medium | Dark-Green | Streaked | Yellow | Hybrid | - | July into August | Beilstein, Doug & Zilis, Mark | .2009 |
| 'Total Justice' | Large | Med-Green | Medial | White | Sport | Pale-Lavender | July into August | Dupre, Dirk | .2014 |
| 'Totally Wacky' | Large | Med-Green | - | - | Unknown | Light-Purple | August | Schwarz, Jim | .2002 |
| 'Toto' | Small | Med-Green | Marginal | White | Hybrid | - | July into August | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Touchdown' | Small | Med-Green | - | - | Hybrid | - | July into August | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Tough Hombre' | Medium | Blue/Green | Streaked | Green | Hybrid | Med-Lavender | June into July | Elslager, Ed | .2003 |
| 'Tower of London' | Medium | Med-Green | Streaked | Speckles | TC Sport | Pale-Lavender | July into August | Zilis, Mark | .2009 |
| 'Trafalgar Square' | Medium | Dark-Green | - | - | Unknown | - | August | Ruh, Peter & Ruh, Jean | .2005 |
| 'Transformer' | - | Dark-Green | Medial | White | Unknown | - | - | Beilstein, Doug & Beilstein, Mardy | .2009 |
| 'Transitions' | Large | Med-Green | Marginal | Yellow | Hybrid | Med-Lavender | July into August | Dean, Don | .2016 |
| 'Travelin' Man' | Medium | Med-Green | Medial | Yellow | Unknown | - | - | Port, Linda | --NR-- |
| 'Tremont Back to Yellow' | Large | Yellow | - | - | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Tremont Blue Flare' | Medium | Blue/Green | - | - | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Tremont Ebony Angel' | Medium | Light-Green | - | - | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Tremont Keynote' | Large | Dark-Green | - | - | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Tremont Mainstay' | Small | Blue/Green | - | - | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Tremont Mirage' | Medium | Med-Green | - | - | Unknown | Pure-White | - | Livingston, Ron | --NR-- |
| 'Tremont Super Blue' | Large | Blue/Green | - | - | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Tremont Uplifted Heart' | Large | Blue/Green | - | - | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Tremont Yellow Glory' | Large | Blue/Green | - | - | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Tremont Yellow Pebbles' | Giant | Blue/Green | Streaked | Yellow | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Tremors' | Small | Med-Green | - | - | Unknown | - | - | Terpening, Kent | --NR-- |
| 'Tropic Sunset' | Medium | Dark-Green | Medial | Yellow | Sport | - | - | Zilis, Mark | .2012 |
| 'Tropical Dancer' | Medium | Med-Green | Marginal | White | Sport | Pale-Lavender | June into July | Van den Top, Jan & Van Eechaute, Danny | .2008 |
| 'Tropical Highland' | Large | Dark-Green | - | - | Unknown | Pale-Lavender | July | Hanson, Curt | --NR-- |
| 'Tropicana' | Large | Light-Green | Marginal | White | Hybrid | Pale-Lavender | July into August | Zilis, Mark | .2010 |
| 'Tupelo Honey' | Large | Yellow | - | - | Unknown | - | June into July | Wasitis, Chick | .2011 |
| 'Turnabout' | Medium | Med-Green | Marginal | White | Hybrid | Pale-Lavender | July into August | Lydell, Ransom | .2001 |
| 'Turning Point' | Medium | Med-Green | - | - | Sport | Pale-Lavender | August | Lydell, Ransom | --NR-- |
| 'Tweetypie' | Small | Yellow | - | - | Unknown | - | - | Unknown | --NR-- |
| 'Twirlatini' | Small | Blue/Green | - | - | Hybrid | Light-Purple | July into August | Zilis, Mark | .2010 |
| 'Twist of Dwarf' | Small | Med-Green | Medial | White | Sport | - | June into July | Brinker, Larry | .2010 |
| 'Twisting the Night Away' | Miniature | Dark-Green | Medial | White | Unknown | - | - | Klapwijk, Pieter | --NR-- |
| 'Twizzler' | Medium | Blue/Green | - | - | Hybrid | Light-Purple | July into August | Elchuk, Kevin & Elchuk, Olga | .2015 |
| 'Tyler John' | Large | Blue/Green | Streaked | Yellow | Unknown | Near-White | July into August | Hackbarth, Robert | .2015 |
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