| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Kempen Sky High' | Medium | Blue/Green | - | - | Hybrid | Light-Purple | July into August | Butaye, Patrick | .2015 |
| 'Key Largo' | Medium | Med-Green | Streaked | Yellow | Sport | - | - | Malloy, Alex | --NR-- |
| 'King Cobra' | Medium | Light-Green | - | - | Hybrid | Pale-Lavender | June into July | Scheer, Alttara & Gilligan, Madelon | .2015 |
| 'King David' | Medium | Blue/Green | - | - | Hybrid | Near-White | July into August | Zolock, Steve & Zolock, Sarah | .2001 |
| 'King's Black Knight' | Large | Dark-Green | - | - | Hybrid | Pale-Lavender | July into August | King, Herb & King, Gladys | .2006 |
| 'King's Ransom' | Medium | Light-Green | - | - | Hybrid | Near-White | July into August | Dean, Don | .1999 |
| 'Kinky Boots' | Medium | Blue/Green | Marginal | White | Sport | Pale-Lavender | July into August | Dean, Don | .2014 |
| 'Kismet' | Small | Med-Green | Medial | White | Sport | - | - | Malloy, Alex | --NR-- |
| 'Kitty Hawk' | Medium | Yellow | - | - | Hybrid | Pale-Lavender | August | Herold, Roy | .2000 |
| 'Kiwi Blue Sky' | Small | Blue/Green | - | - | Hybrid | Pure-White | June into July | Sligh, Barry | .1999 |
| 'Kiwi Full Monty' | Medium | Blue/Green | Medial | White | Sport | Pale-Lavender | July | Sligh, Barry | .2000 |
| 'Knockin' on Heaven's Door' | - | - | - | - | Unknown | - | - | Vasey, Mike | --NR-- |
| 'Kong' | Large | Med-Green | - | - | Hybrid | Near-White | June into July | Soules, Clarence | .1990 |
| 'Kronos' | Medium | Med-Green | Marginal | Yellow | Unknown | - | - | Dalton, Jim & Dalton, Meg | --NR-- |
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