| Cultivar Name | Plant Size | Origin | Flower Color | Season | Source | Registered |
| 'L.E.W.' | Large | Sport | Near-White | June into July | Willar, Russ | .2008 |
| 'Lady Abigail' | Small | Hybrid | Near-White | July | Kwick, Charles | .2018 |
| 'Lady Christin May' | Small | Hybrid | Light-Purple | August to September | Kwick, Charles | .2016 |
| 'Lady Klara-Maren' | Medium | Hybrid | Deep-Purple | July into August | Kwick, Charles | .2018 |
| 'Lady Michelle' | Large | Hybrid | Near-White | August to October | Zolock, Steve & Zolock, Sarah | .2003 |
| 'Ladybug' | Small | Hybrid | Pale-Lavender | July | Ward, Dr Dick & Ward, Jane | .1996 |
| 'Lakeside Down Sized' | Miniature | Hybrid | Pale-Lavender | August | Chastain, Mary | .2003 |
| 'Lakeside Frosted Mint' | Large | Unknown | Pure-White | June | Chastain, Mary | .1996 |
| 'Lakeside Leprechaun' | Medium | Sport | Near-White | June into July | Chastain, Mary | .1991 |
| 'Lakeside Lime Tart' | Small | Hybrid | Med-Lavender | July | Chastain, Mary | .2002 |
| 'Lakeside Little Vamp' | Miniature | Hybrid | Pale-Lavender | June | Chastain, Mary | .2006 |
| 'Lakeside Mom' | Medium | Unknown | Med-Lavender | July | Chastain, Mary | .1999 |
| 'Lakeside Plum Frosting' | Small | Hybrid | Pale-Lavender | August | Chastain, Mary | .2006 |
| 'Lakeside San Ho Ta' | Large | Hybrid | Pale-Lavender | June into July | Chastain, Mary | .2006 |
| 'Lakeside Sapphire' | - | Unknown | - | - | Chastain, Mary | --NR-- |
| 'Lakeside Triple Crown' | Miniature | Unknown | Pale-Lavender | June into July | Chastain, Mary | .2000 |
| 'Lakeside Twiddle Dee' | Small | Hybrid | Light-Purple | July into August | Chastain, Mary | .1996 |
| 'Lancifolia Stepánková' | Medium | Unknown | Light-Purple | - | Unknown | --NR-- |
| 'Lavender Love' | Small | Unknown | - | - | Unknown | --NR-- |
| 'Lemon Lime' | Medium | Hybrid | Deep-Purple | July | Savory, Robert | .1977 |
| 'Lemon Love Note' | Small | Hybrid | Med-Lavender | July | Beilstein, Doug | --NR-- |
| 'Lemon Sangria' | Large | Unknown | - | - | Sisson, Kathie | --NR-- |
| 'Lemon Zest' (Zilis) | Miniature | Hybrid | - | - | Zilis, Mark | .2009 |
| 'Leprechaun's Lair' | Small | Unknown | Light-Purple | - | Moldovan, Steve | --NR-- |
| 'Lighthouse' (Elslager) | Giant | Hybrid | Near-White | July | Elslager, Ed | .2003 |
| 'L'Île d'Orléans' | Medium | Unknown | Near-White | - | Bastille, Jocelyne | --NR-- |
| 'Lime Custard' | Large | Hybrid | - | July into August | Donsky, George | .2009 |
| 'Lime Delight' | - | Unknown | - | - | Schmidt, Bevie | --NR-- |
| 'Lime Knack' | Small | Hybrid | Med-Lavender | June into July | Kuenster, Rod | .2012 |
| 'Lime Leader' | Large | Unknown | - | June into July | Schulz, Ed | .2013 |
| 'Lime Passion' | Large | Unknown | - | - | Gilligan, Madelon | --NR-- |
| 'Lime Regal' | Large | Hybrid | Pale-Lavender | June into July | Zilis, Mark | .2009 |
| 'Lime Ripple' | Large | Unknown | - | June into July | Schulz, Ed | .2011 |
| 'Limelighter's Glow' | Large | Unknown | Pale-Lavender | - | Minks, Eldren & Malloy, Alex | .2000 |
| 'Limetini' | Small | Hybrid | Light-Purple | August to September | Zilis, Mark | .2009 |
| 'Limoges' | - | Unknown | Med-Lavender | - | Davidson, LeRoy | --NR-- |
| 'Limon' | Large | Unknown | Med-Lavender | June | Sellers, Van | .1983 |
| 'Limoncello' | Small | Unknown | - | - | Dalton, Jim & Dalton, Meg | --NR-- |
| 'Little Big Man' | Medium | Unknown | - | - | Unknown | --NR-- |
| 'Little Black Scape' | Medium | Hybrid | Light-Purple | July | Avent, Tony | .1995 |
| 'Little Lemon Drop' | Miniature | Unknown | Light-Purple | July | Ruh, Peter & Ruh, Jean | .2005 .2018 |
| 'Little Maddie' | Miniature | Hybrid | Pale-Lavender | July into August | Van Wyke, Trudy | .2006 |
| 'Lizz' | Small | Unknown | - | - | Plater-Zyberk, Maria | --NR-- |
| 'Long Tom' | Large | Hybrid | Pure-White | August | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Lord Brendan' | Medium | Hybrid | Pale-Lavender | July into August | Kwick, Charles | .2017 |
| 'Lotte's Love' | Small | Hybrid | Pale-Lavender | July into August | Vissers, Louis | .2017 |
| 'Lotus Woods' | Giant | Unknown | Light-Purple | July into August | Mack, Carl & Ruh, Peter & Ruh, Jean | .2002 |
| 'Lusty Mae' | Large | Unknown | - | - | Scheer, Alttara | --NR-- |
| 'Lytton Strachey' | Small | Unknown | - | - | Crockett, Clyde | --NR-- |
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