| 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 |
| 'Tara' | Small | Med-Green | Marginal | Yellow | Hybrid | Pale-Lavender | July | Goodwin, Randy | .2000 |
| 'Tarzan' | - | - | - | - | Hybrid | - | - | Moore, Jeff | --NR-- |
| 'Teacher's Pet' | Medium | Blue/Green | Marginal | White | Hybrid | Near-White | June into July | Asch, Stuart | .2000 |
| 'Technicolor' | Large | Med-Green | Streaked | Yellow | Hybrid | Pale-Lavender | June into July | Elslager, Ed | .2005 |
| 'Terminator' | - | Blue/Green | Streaked | Yellow | Unknown | - | - | Elslager, Ed | .2003 |
| 'Terms of Endearment' | Giant | Blue/Green | Marginal | Yellow | Hybrid | Near-White | June into July | Hansen, Hans | .2020 |
| '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 Black Cat' | - | - | - | - | Unknown | - | - | Moore, Jeff | --NR-- |
| 'The Brothers Karamazov' | - | - | - | - | Unknown | - | - | Moore, Jeff | --NR-- |
| 'The Children's Hour' | - | - | - | - | Hybrid | - | - | Tompkins, Chet | --NR-- |
| 'The Enforcer' | Medium | Blue/Green | Streaked | White | Unknown | - | August | Schwarz, Jim | .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 Godfather' | Giant | Blue/Green | - | - | Unknown | Near-White | August | Ward, Dr Dick & Ward, Jane | .1998 |
| 'The Green Hornet' | Large | Med-Green | Streaked | Yellow | Hybrid | Pale-Lavender | July | Elslager, Ed | .2004 |
| 'The Hulk' | Giant | Dark-Green | - | - | Unknown | Light-Purple | July | Bennerup, Pierre & Malloy, Alex | .1998 |
| 'The Leading Edge' | Giant | Med-Green | Marginal | Yellow | Hybrid | Pale-Lavender | June into July | Elslager, Ed | .2002 |
| 'The Perfect Storm' | Medium | Med-Green | Streaked | White | Hybrid | Near-White | August | Wrede, Arthur | .2005 |
| 'The Pit and The Pendulum' | - | - | - | - | Unknown | - | - | Moore, Jeff | --NR-- |
| 'The Postman' | - | - | - | - | Unknown | - | - | Unknown | --NR-- |
| 'The Queen' | Medium | Yellow | Marginal | Blue-Green | Sport | Pale-Lavender | July | Schwarz, Jim | .2007 |
| 'The Razor's Edge' | Small | Med-Green | - | - | Hybrid | Pale-Lavender | August to September | Terpening, Kent & The American Hosta Society | .2019 |
| 'The Right Stuff' | Large | Med-Green | Streaked | Speckles | Hybrid | Med-Lavender | July | Elslager, Ed | .2001 |
| 'The Shining' | Large | Yellow | - | - | Sport | Pale-Lavender | August | Hansen, Hans | --NR-- |
| 'The Sleeper' | Medium | Med-Green | - | - | Hybrid | Med-Lavender | June into July | Gilligan, Madelon | .2017 |
| 'The Stand' | - | - | - | - | Unknown | - | - | Moore, Jeff | --NR-- |
| 'The Sun King' | Large | Yellow | - | - | Unknown | Near-White | July | O'Harra, Russ | .1999 |
| 'Thumbelina' | Small | Med-Green | Marginal | White | Hybrid | Light-Purple | July | Ward, Dr Dick & Ward, Jane | .1996 |
| 'Tiffney's Darth Vader' | Large | Dark-Green | - | - | Sport | Med-Lavender | August to October | Dreessen, Jack | .1999 |
| 'Tiffney's Godzilla' | Giant | Med-Green | Marginal | Yellow | Sport | Pale-Lavender | July into August | Dreessen, Jack | .1996 |
| 'Tiffney's Gold Digger' | Large | Light-Green | - | - | Sport | Pale-Lavender | July | Dreessen, Jack | .1999 |
| 'Tigger' | Medium | Dark-Green | Streaked | Yellow | Hybrid | Pale-Lavender | June into July | Simmering, Ron | .2000 |
| 'Time Traveler' | Large | Med-Green | Streaked | White | Sport | Pale-Lavender | June into July | Avent, Tony | .2010 |
| 'Time Tunnel' | Medium | Blue/Green | Marginal | Yellow | TC Sport | Near-White | June into July | Laviana, Marc & Malloy, Alex | .2001 |
| 'Titanic' | Giant | Med-Green | Marginal | Yellow | Sport | Pale-Lavender | July into August | Hansen, Hans & Shady Oaks Nursery | .1999 |
| 'Tobacco Road' | - | Yellow | Marginal | Green | Hybrid | - | June into July | Petryszyn, Olga | .2010 |
| 'Tom Thumb' | Miniature | Med-Green | - | - | Unknown | - | - | Fransen, Marco | --NR-- |
| 'Top Dog' | Medium | Yellow | - | - | Hybrid | - | June into July | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Topaz' (Johnson) | Medium | Blue/Green | - | - | Hybrid | Light-Purple | July into August | Johnson, Greg | .2004 |
| 'Topaz' (Summers) | Small | Med-Green | | - | Sport | Pale-Lavender | July | Summers, Alex | --NR-- |
| 'Topsy-turvy' | Medium | Dark-Green | Streaked | White | Hybrid | Pale-Lavender | July | Elslager, Ed | .2000 |
| 'Toto' | Small | Med-Green | Marginal | White | Hybrid | - | July into August | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Touch of Class' | Medium | Blue/Green | Medial | Yellow | TC Sport | Pale-Lavender | July | Hansen, Hans & Shady Oaks Nursery | .1999 |
| 'Touchdown' | Small | Med-Green | - | - | Hybrid | - | July into August | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Towering Inferno Remembered' | Large | Blue/Green | Streaked | Yellow | Hybrid | Pale-Lavender | June into July | Elslager, Ed | .2001 |
| 'Toy Soldier' | Medium | Blue/Green | Marginal | Yellow | Sport | Pale-Lavender | July | Solberg, Robert | .2000 |
| 'Treasure Island' | Small | Dark-Green | - | - | Hybrid | Light-Purple | August to October | Avent, Tony | .1998 |
| 'Tropic Thunder' | Medium | Med-Green | Marginal | Yellow | Hybrid | - | - | Ward, Dr Dick & Ward, Jane | .2012 |
| 'True Heart' | Giant | Blue/Green | - | - | Unknown | - | June into August | Schulz, Ed | .2013 |
| 'True Love' | Medium | Blue/Green | - | - | Hybrid | - | - | Aden, Paul | .1979 |
| 'Turning Point' | Medium | Med-Green | - | - | Sport | Pale-Lavender | August | Lydell, Ransom | --NR-- |
| 'Twilight Zone' | Large | Med-Green | Streaked | Yellow | Sport | Pale-Lavender | - | Haskell, Allen & Malloy, Alex | .1999 |
| 'Tycoon' | Medium | Med-Green | Marginal | Yellow | Unknown | - | - | Malloy, Alex | --NR-- |
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