| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Ka-ching' | Giant | Dark-Green | - | - | Unknown | Pale-Lavender | June into July | Zolock, Steve & Zolock, Sarah | .2011 |
| 'Karamoosh' | Large | Dark-Green | Marginal | White | Hybrid | Med-Lavender | July into August | Kuk, Bob | .2008 |
| 'Kathy's Clown' | Large | Dark-Green | Medial | Yellow | Sport | Med-Lavender | July into August | Ripperger, Kathy | .2008 |
| 'Keuka Kiss' | Large | Dark-Green | - | - | Hybrid | Pale-Lavender | July into August | Brandt-Sorheim, Peter & McElwee, Molly | .2002 |
| 'Key Lime Pie' (Lydell) | Medium | Light-Green | Marginal | Yellow | Unknown | | | Lydell, Ran | --NR-- |
| 'Key West' | Giant | Yellow | - | - | Hybrid | Near-White | June into July | Petryszyn, Olga | .1999 |
| 'Kinbuchi Tachi' | Large | Dark-Green | Marginal | White | Sport | Light-Purple | August to September | Unknown & Ruh, Peter | .2002 .2018 |
| 'King of Buchanan' | Medium | Med-Green | Marginal | Yellow | Hybrid | Near-White | June into July | Groothuis, Mike | .2019 |
| 'King's Accomplice' | Medium | Med-Green | Marginal | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Ambassador' | Large | Dark-Green | Marginal | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Baroness' | Large | Light-Green | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Bishop' | Large | Blue/Green | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Black Knight' | Large | Dark-Green | - | - | Hybrid | Pale-Lavender | July into August | King, Herb & King, Gladys | .2006 |
| 'King's Brute' | Medium | Blue/Green | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Dandy' | Large | Yellow | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Dominion' | Large | Blue/Green | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Duke of Norfolk' | Large | Med-Green | Marginal | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Elegance' | Medium | Yellow | Streaked | Green | Unknown | - | - | King, Herb | --NR-- |
| 'King's Emerald Charm' | Large | Dark-Green | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Garland of Gold' | Small | Yellow | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Gauntlet' | Small | Light-Green | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Gold Dust' | Large | Light-Green | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Golden Goddess' | Medium | Yellow | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Golden Sunset' | Large | Yellow | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Goldsmith' | Large | Yellow | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Green Charmer' | Medium | Dark-Green | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Hidden Treasure' | Large | Blue/Green | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Highcliff Castle' | Medium | Blue/Green | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Lady Bernadette' | Medium | Med-Green | Marginal | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Libertine' | Large | Med-Green | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Lord Lionel' | Medium | Med-Green | Streaked | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Mentor' | Medium | Dark-Green | Marginal | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Princess Charlotte' | Large | Med-Green | Marginal | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Princess Ming' | Medium | Med-Green | Marginal | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Prominence' | Large | Dark-Green | Streaked | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Regency' | Medium | Yellow | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'King's Sir Herbert' | Large | Blue/Green | Streaked | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Sir Lucan' | Medium | Med-Green | Marginal | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Treasure Chest' | Small | Dark-Green | Marginal | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Tribute' | Large | Dark-Green | Marginal | Yellow | Unknown | - | - | King, Herb | --NR-- |
| 'King's Vision' | Large | Light-Green | - | - | Unknown | - | - | King, Herb | --NR-- |
| 'Kingsize' | Giant | Dark-Green | - | - | Sport | Pale-Lavender | June | Van Eechaute, Danny | .2013 |
| 'Kinki' | Large | Yellow-Gold | - | - | Unknown | Med-Lavender | July into August | Ruh, Peter | .2002 .2018 |
| 'Kinky Boots' | Medium | Blue/Green | Marginal | White | Sport | Pale-Lavender | July into August | Dean, Don | .2014 |
| 'Kirkside Golden Parachute' | Giant | Yellow-Gold | | | Hybrid | Pale-Lavender | July | Hanna, Clarence | .2021 |
| 'Kiss and Surrender' | Medium | Light-Green | - | - | Hybrid | Pale-Lavender | August to September | Kwick, Charles | .2018 |
| 'Kissing Cousin' | Medium | Blue/Green | Marginal | White | Sport | Pale-Lavender | July into August | Elslager, Ed | .1998 |
| 'Kiwi Blue Marble' | Large | Blue/Green | Streaked | Yellow | Sport | Pale-Lavender | July into August | Sligh, Barry | --NR-- |
| 'Kiwi Cream Edge' | Medium | Yellow | Marginal | White | Unknown | - | July into August | Jury, Felix & Walek, Kevin | .2009 |
| 'Klingon' | Medium | Dark-Green | - | - | Sport | Pale-Lavender | June into July | Zilis, Mark & Schwarz, Jim | --NR-- |
| 'Koneko' | Large | Med-Green | Marginal | White | Unknown | Light-Purple | July | Olson, Dr Robert | .1999 |
| 'Konkubine' | Medium | Yellow | - | - | Unknown | Pale-Lavender | July | Klose, Heinz & Ruh, Peter & Ruh, Jean | .2005 |
| 'Kung Fu Kenny' | Large | Blue/Green | | | Hybrid | Pale-Lavender | July | Kwick, Charles | .2021 |
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