| Cultivar | Reference | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Kaleidoscope' | - A Great Big World | Small | Med-Green | Streaked | White | Hybrid | - | - | Malloy, Alex | --NR-- |
| 'Karenka' | - Singer | Medium | Med-Green | - | - | Hybrid | Pure-White | - | Sugita, Hajime | --NR-- |
| 'Karma Chameleon' | - Culture Club | Medium | Yellow | | | Hybrid | | | Wols, Dan | --NR-- |
| 'Kathy's Clown' | - Everly Brothers | Large | Dark-Green | Medial | Yellow | Sport | Med-Lavender | July into August | Ripperger, Kathy | .2008 |
| 'Keep it Dark' | - Genesis | Medium | Dark-Green | - | - | Hybrid | - | - | Gilligan, Madelon | --NR-- |
| 'Keepsake' | - State Radio | Small | Med-Green | Marginal | Yellow | Hybrid | Pale-Lavender | June into July | Jones, Gil | .2007 |
| 'Kelsey' | - Metro Station | Medium | Med-Green | - | - | Hybrid | Pale-Lavender | August to October | Williams, Frances & Ruh, Peter | .1996 |
| 'Kempen Metallica' | - Metallica (Rock Band) | Medium | Blue/Green | | | Unknown | Near-White | | Butaye, Patrick | --NR-- |
| 'Kempen Sky High' | - Jigsaw | Medium | Blue/Green | - | - | Hybrid | Light-Purple | July into August | Butaye, Patrick | .2015 |
| 'Kerplunk' | - Green Day | Medium | Yellow | - | - | Hybrid | Pale-Lavender | August | Benedict, Dr Ralph (Herb) & Ruh, Peter | .2005 |
| 'Key Largo' | - Bertie Higgins | Medium | Med-Green | Streaked | Yellow | Sport | - | - | Malloy, Alex | --NR-- |
| 'Kill Me Softly' | - Roberta Flack | Small | Dark-Green | - | - | Unknown | - | - | Scheer, Alttara | --NR-- |
| 'Kind of Blue' | - Miles Davis | Large | Blue/Green | - | - | Unknown | - | July | Ward, Dr Dick & Ward, Jane | .1999 |
| 'King Crimson' | - Rock Band | Medium | Med-Green | - | - | Unknown | - | - | Unknown | --NR-- |
| 'King Lizard' | - Songwriter | Large | Dark-Green | - | - | Hybrid | Light-Purple | July | Rogers, Floyd | .2003 |
| 'King of Spades' | - Blues/Rock Band | Medium | Dark-Green | - | - | Hybrid | Med-Lavender | August to October | Beilstein, Doug & Beilstein, Mardy | .2007 |
| 'King Tut' | - Steve Martin | Large | Yellow | - | - | Hybrid | Near-White | June into July | Harshbarger, Gretchen | .1982 |
| 'King's Mysterious Lady' | - Billy Ocean | Small | Yellow | - | - | Unknown | - | - | King, Herb & King, Gladys | --NR-- |
| 'Kira' | - Singer | Large | Blue/Green | Marginal | Yellow | Unknown | Pale-Lavender | July | Maroushek, Lillian | .1999 |
| 'Kissing Cousin' | - Elvis Presley | Medium | Blue/Green | Marginal | White | Sport | Pale-Lavender | July into August | Elslager, Ed | .1998 |
| 'Kiwi Black Magic' | - Little Mix | Large | Dark-Green | - | - | Hybrid | Light-Purple | July into August | Sligh, Barry | .1999 |
| 'Kiwi Blue Canoe' | - Blue Mountain | Small | Blue/Green | - | - | Unknown | - | - | Sligh, Barry | --NR-- |
| 'Kiwi Blue Sky' | - Allman Bros Band | Small | Blue/Green | - | - | Hybrid | Pure-White | June into July | Sligh, Barry | .1999 |
| 'Knockin' on Heaven's Door' | - Bob Dylan | - | - | - | - | Unknown | - | - | Vasey, Mike | --NR-- |
| 'Knockout' | - Lil Wayne | Medium | Med-Green | Marginal | Creamy White | Hybrid | Pale-Lavender | June into July | Aden, Paul | .1986 |
| 'Komodo Dragon' | - Thomas Newman | Large | Med-Green | - | - | Hybrid | Pale-Lavender | June | Seaver, Mildred | .2004 |
| 'Kryptonite' | - 3 Doors Down | Medium | Dark-Green | - | - | Sport | Pale-Lavender | July into August | Tramposch, Kurt & Walek, Kevin | .2009 |
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