| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Kasseler Blue' | Medium | Blue/Green | - | - | Unknown | - | - | Klose, Heinz & Ruh, Peter & Ruh, Jean | .2008 |
| 'Kasseler Gold' | Medium | Yellow | - | - | Hybrid | Pale-Lavender | June into July | Klose, Heinz & Ruh, Peter & Ruh, Jean | .2003 |
| 'Kazaguruma' | Medium | - | - | - | Hybrid | - | - | Sneyers, Rob | --NR-- |
| 'Kempen Cream Star' | Medium | - | - | - | Hybrid | - | - | Butaye, Patrick | --NR-- |
| 'Kempen Rhubarb Taste' | Large | Med-Green | - | - | Unknown | - | - | Butaye, Patrick | --NR-- |
| 'Kempen Salad Bar' | Medium | Med-Green | Streaked | White | Hybrid | - | - | Butaye, Patrick | --NR-- |
| 'Kempen Sorbet' | Medium | Yellow | | | Nat-Sport | Med-Lavender | August to September | Butaye, Patrick | --NR-- |
| 'Key Lime' | Medium | Light-Green | - | - | Unknown | Pale-Lavender | July into August | Banyai, Pauline & Banyai, Bruce | .1990 |
| 'Key Lime Pie' (Hansen) | Medium | Med-Green | Marginal | Yellow | Sport | Light-Purple | July | Hansen, Hans | .2003 |
| 'Kit Kat' | Large | Light-Green | - | - | Sport | Near-White | June into July | Smetana, Don | .1994 |
| 'Kiwi Buttercrunch' | Small | Yellow | - | - | Unknown | - | - | Sligh, Barry | --NR-- |
| 'Kiwi Citrus' | Large | Med-Green | Marginal | Yellow | Unknown | - | - | Sligh, Barry | --NR-- |
| 'Kiwi Fresh Salad' | Medium | Yellow | - | - | Hybrid | - | - | Sligh, Barry | --NR-- |
| 'Kiwi Lemon Twist' | Large | Yellow | Marginal | Green | Sport | Near-White | June into July | Sligh, Barry | --NR-- |
| 'Kiwi Milky Way' | Large | Blue/Green | - | - | Sport | Near-White | June into July | Sligh, Barry | .2000 |
| 'Kiwi Spearmint' | Small | Med-Green | Medial | White | Sport | Pale-Lavender | July | Sligh, Barry | .1999 |
| 'Kristie's Key Lime Pie' | Large | Yellow | - | - | Unknown | Near-White | June | Unknown | --NR-- |
| 'Krossa Cream Puff' | - | - | - | - | Unknown | - | - | Krossa, Gus | --NR-- |
| 'Kwick's Salad Bowl' | Large | Med-Green | - | - | Hybrid | Near-White | June into July | Kwick, Charles | .2017 |
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