| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Talladega' | Large | Blue/Green | - | - | Hybrid | Med-Lavender | - | Visser, Cees | --NR-- |
| 'Tarheel Blue' | Medium | Blue/Green | - | - | Hybrid | - | - | Solberg, Robert | .2013 |
| 'The Horseshoe' | Large | Blue/Green | - | - | Hybrid | Pale-Lavender | June into July | Beilstein, Doug & Beilstein, Mardy | .2018 |
| 'The Minnesota Mafia' | Large | Yellow | - | - | Hybrid | - | June into July | Naylor Creek Nursery & Larsen, Kim | .2009 |
| 'Thelma Rudolph' | Large | Med-Green | - | - | Unknown | - | - | Ward, Dr Dick & Ward, Jane | --NR-- |
| 'Touchdown' | Small | Med-Green | - | - | Hybrid | - | July into August | Ward, Dr Dick & Ward, Jane | .2009 |
| 'Trifecta' | Small | Med-Green | Medial | White | Sport | Pale-Lavender | June | Birks, A. & Briggs Nursery-MA | .2008 |
| 'Triple Double' | Medium | Blue/Green | - | - | Hybrid | - | - | Jolliffe, Thomas | --NR-- |
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