| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Templar Gold' | Medium | Yellow | - | - | Unknown | Med-Lavender | July | Deckert, Emile & Deckert, Jane | .2004 |
| 'Temple of Karnak' | Medium | Dark-Green | - | - | Unknown | Near-White | July | Van Ostrand, John | --NR-- |
| 'The Sun' | Large | Yellow | - | - | Unknown | Med-Lavender | July | Goodwin, Randy | .2021 |
| 'Thea' | Medium | Med-Green | Streaked | White | Sport | Pale-Lavender | July into August | Stratham, Netta & Bond, Sandra | .1985 |
| 'Tom Terrific' | Large | Yellow | - | - | Hybrid | Pale-Lavender | July into August | Solberg, Robert | .2019 |
| 'Tomoko' | Medium | Blue/Green | - | - | Unknown | Near-White | July | Klose, Heinz & Ruh, Peter | .2003 |
| 'Too Darn Hot' | Medium | Yellow | - | - | Hybrid | Near-White | July | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Tower of Power' | Giant | Med-Green | - | - | TC Sport | Near-White | July | Mortko, Rob | --NR-- |
| 'Tres Vert' | Large | Dark-Green | - | - | Unknown | - | - | Horn, Lori | --NR-- |
| 'Trouve' | Medium | Yellow | Streaked | Green | Hybrid | Light-Purple | July into August | Desgranges, K. | .2021 |
|