| Cultivar Name | Source | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Registered |
| 'Don't Envy Me' | Fransen, Marco & Joyce | Small | Med-Green | - | - | Sport | Light-Purple | June into July | --NR-- |
| 'Talladega' | Visser, Cees | Large | Blue/Green | - | - | Hybrid | Med-Lavender | - | --NR-- |
| 'Tango' | Heemskerk, Gerardus | Medium | Dark-Green | Marginal | Yellow | Sport | Pure-White | July | .2005 |
| 'Tattle Tails' | Fransen, Marco | Miniature | Med-Green | Marginal | Yellow | Sport | Med-Lavender | July | --NR-- |
| 'Teacher's Pride' | Fransen, Marco & Joyce & van Rossum, Jannes | Medium | Blue/Green | Medial | White | Sport | Med-Lavender | July | --NR-- |
| 'Theo's Blue' | Zonneveld, Ben & Leydens, Theo | Medium | Blue/Green | - | - | Hybrid | Med-Lavender | - | --NR-- |
| 'Theo's Green' | Leydens, Theo & Van Eechaute, Danny | - | Med-Green | - | - | Unknown | - | - | --NR-- |
| 'Theo's Red' | Leydens, Theo | Medium | Med-Green | - | - | Hybrid | Med-Lavender | - | --NR-- |
| 'Timeless Beauty' | Heemskerk, Gerardus | Medium | Blue/Green | Medial | White | Sport | Med-Lavender | July into August | .2011 |
| 'Tom Thumb' | Fransen, Marco | Miniature | Med-Green | - | - | Unknown | - | - | --NR-- |
| 'Top of Mount Fuji' | Fransen, Marco & Joyce | Large | Med-Green | - | - | TC Sport | Pale-Lavender | July | --NR-- |
| 'Touch of Frost' | Fransen, Marco | Medium | Blue/Green | - | - | Sport | Pale-Lavender | July | --NR-- |
| 'Treasure Hunt' | Fransen, Marco & Joyce | Medium | Med-Green | Marginal | Yellow | Sport | Pale-Lavender | July | --NR-- |
| 'Tropical Dancer' | van den Top, Jan & Van Eechaute, Danny | Medium | Med-Green | Marginal | White | Sport | Pale-Lavender | June into July | .2008 |
| 'Tropical Sunrise' | van den Top, Jan | Large | Yellow | Marginal | White | Sport | Med-Lavender | July | --NR-- |
| 'Twilight' | Van Eijk-Bos, Gert & Van Erven, Dirk | Large | Dark-Green | Marginal | Yellow | Sport | Med-Lavender | July into August | .1997 .2018 |
| 'Twist of Green' | Fransen, Marco & Joyce | Small | Med-Green | - | - | Sport | Light-Purple | July | --NR-- |
| 'Twister' | van den Top, Jan | Medium | Dark-Green | Medial | Yellow | Sport | Med-Lavender | July into August | --NR-- |
| 'Two Tone' | Fransen, Marco & Joyce | Small | Light-Green | - | - | Sport | Med-Lavender | - | --NR-- |
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