| Cultivar Name | Plant Size | Origin | Flower Color | Season | Source | Registered |
| 'L.E.W.' | Large | Sport | Near-White | June into July | Willar, Russ | .2008 |
| 'La Belle Norma' | Giant | Unknown | Pale-Lavender | July | Bastille, Jocelyne | --NR-- |
| 'Lady Abigail' | Small | Hybrid | Near-White | July | Kwick, Charles | .2018 |
| 'Lady Christin May' | Small | Hybrid | Light-Purple | August to September | Kwick, Charles | .2016 |
| 'Lady Helen' | Large | Unknown | Pale-Lavender | July | Holly, Gladys & Ruh, Peter | .1998 |
| 'Lady in Red' | Small | Unknown | Near-White | June into July | Whitmore, Bob & Avent, Tony | --NR-- |
| 'Lady Jane' | Large | Sport | Light-Purple | July | Ward, Dr Dick & Ward, Jane | .2005 |
| '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 |
| 'Lady Singer' | Large | Unknown | - | - | Balitewicz, Bob | --NR-- |
| 'Ladybug' | Small | Hybrid | Pale-Lavender | July | Ward, Dr Dick & Ward, Jane | .1996 |
| 'Laguna Seca' | Medium | Unknown | - | - | Visser, Cees | --NR-- |
| 'Lake Chautauqua' | Large | Unknown | Light-Purple | July | Sugita, Hajime & Ruh, Peter | .1998 |
| 'Lake Erie' | Giant | Hybrid | Near-White | June into July | Ruh, Peter | .1998 |
| 'Lake Huron' | Medium | Hybrid | Light-Purple | August to October | Lydell, Ransom | .2001 |
| 'Lake Macatawa' | Large | Unknown | - | - | Wade, Van | --NR-- |
| 'Lake Michigan' | Medium | Hybrid | Pale-Lavender | September to October | Lydell, Ransom | .2001 |
| 'Lake Orion' | - | Unknown | - | - | Unknown | --NR-- |
| 'Lakeside Accolade' | Large | Hybrid | Pale-Lavender | July into August | Chastain, Mary | .1998 |
| 'Lakeside Black Mama' | Medium | Unknown | Light-Purple | July | Chastain, Mary | .2003 |
| 'Lakeside Black Satin' | Large | Hybrid | Light-Purple | July | Chastain, Mary | .1993 |
| 'Lakeside Breaking Waves' | Medium | Unknown | Near-White | June into July | Chastain, Mary | .2003 |
| 'Lakeside Chatterbox' | Small | Hybrid | Pure-White | July | Chastain, Mary | .1998 |
| 'Lakeside Chick-a-Lick' | Small | Unknown | - | - | Chastain, Mary | --NR-- |
| 'Lakeside Coal Miner' | Medium | Hybrid | Light-Purple | July | Chastain, Mary | .1998 |
| 'Lakeside Cup Up' | Medium | Hybrid | Pale-Lavender | July | Chastain, Mary | .1993 |
| 'Lakeside Dark Dancer' | Medium | Unknown | Med-Lavender | July | Chastain, Mary | .2002 |
| 'Lakeside Down Sized' | Miniature | Hybrid | Pale-Lavender | August | Chastain, Mary | .2003 |
| 'Lakeside Ebony Echoes' | Small | Hybrid | Deep-Purple | July | Chastain, Mary | .2002 |
| 'Lakeside Emerald Lights' | Medium | Hybrid | Light-Purple | July | Chastain, Mary | .1993 |
| 'Lakeside Flame Dance' | Medium | Unknown | Deep-Purple | August | Chastain, Mary | .2006 |
| 'Lakeside Foiled Plot' | Large | Unknown | Pure-White | June into July | Chastain, Mary | .2006 |
| 'Lakeside Fresh Prince' | Large | Unknown | Pure-White | June into July | Chastain, Mary | .2006 |
| 'Lakeside Frosted Mint' | Large | Unknown | Pure-White | June | Chastain, Mary | .1996 |
| 'Lakeside Full Tide' | Large | Unknown | Pale-Lavender | July | Chastain, Mary | .2001 |
| 'Lakeside Grandee' | Medium | Unknown | Pure-White | June | Chastain, Mary | .1994 |
| 'Lakeside Grumpy Green' | Large | Unknown | Pure-White | June | Chastain, Mary | .2006 |
| 'Lakeside Honeymoon' | Small | Sport | Pale-Lavender | July | Chastain, Mary | --NR-- |
| 'Lakeside Khum Kaw' | Giant | Hybrid | Near-White | July into August | Chastain, Mary | .2006 |
| '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 Gem' | Miniature | Unknown | Light-Purple | July | Chastain, Mary | .1993 |
| 'Lakeside Little Vamp' | Miniature | Hybrid | Pale-Lavender | June | Chastain, Mary | .2006 |
| 'Lakeside Lollipop' | Large | Unknown | Pure-White | July | Chastain, Mary | .1993 |
| 'Lakeside Looking Glass' | Medium | Hybrid | Pale-Lavender | August | Chastain, Mary | .1997 |
| 'Lakeside Maestro' | Large | Hybrid | Pale-Lavender | June | Chastain, Mary | .1995 |
| 'Lakeside Maverick' | Giant | Unknown | Near-White | - | Chastain, Mary | .2000 |
| 'Lakeside Midnight Miss' | Medium | Hybrid | Deep-Purple | July into August | Chastain, Mary | .2006 |
| 'Lakeside Mom' | Medium | Unknown | Med-Lavender | July | Chastain, Mary | .1999 |
| 'Lakeside Neat Petite' | Medium | Hybrid | Light-Purple | July | Chastain, Mary | .1991 |
| 'Lakeside Penny Pincher' | Miniature | Unknown | - | July into August | Chastain, Mary | .1998 |
| 'Lakeside Pillow Talk' | Large | Hybrid | Deep-Purple | June | Chastain, Mary | .2004 |
| 'Lakeside Plum Frosting' | Small | Hybrid | Pale-Lavender | August | Chastain, Mary | .2006 |
| 'Lakeside Powder Blue' | Large | Unknown | - | - | Chastain, Mary | --NR-- |
| 'Lakeside Prophesy' | Medium | Unknown | Pale-Lavender | July | Chastain, Mary | .2002 |
| 'Lakeside Rag Bag' | Medium | Unknown | - | - | Chastain, Mary | --NR-- |
| 'Lakeside Ripples' | Giant | Unknown | Pale-Lavender | July | Chastain, Mary | .1991 |
| 'Lakeside Round Table' | Giant | Unknown | Near-White | June | Chastain, Mary | .2002 |
| 'Lakeside San Ho Ta' | Large | Hybrid | Pale-Lavender | June into July | Chastain, Mary | .2006 |
| 'Lakeside Sapphire' | - | Unknown | - | - | Chastain, Mary | --NR-- |
| 'Lakeside Sir Logan' | Medium | Unknown | Light-Purple | August | Chastain, Mary | .2002 |
| 'Lakeside Sparkle Plenty' | Medium | Unknown | Deep-Purple | July into August | Chastain, Mary | .1995 |
| 'Lakeside Storm Watch' | Small | Hybrid | Light-Purple | July | Chastain, Mary | .2003 |
| 'Lakeside Surf Rider' | Large | Hybrid | Near-White | June | Chastain, Mary | .1997 |
| '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 |
| 'Lakeside Wet Look' | - | Unknown | - | - | Chastain, Mary | --NR-- |
| 'Lakota' | Medium | Unknown | - | - | Wade, Van | --NR-- |
| 'Lancifolia' | Medium | Unknown | Med-Lavender | August to October | Unknown | --NR-- |
| 'Lancifolia Stepánková' | Medium | Unknown | Light-Purple | - | Unknown | --NR-- |
| 'LaPaloma' | Medium | Hybrid | Pale-Lavender | August to September | Brandt-Sorheim, Peter | .2002 |
| 'Larry' | Medium | Unknown | - | - | Unknown | --NR-- |
| 'Last Train Home' | Large | Sport | Near-White | June into July | Fransen, Marco & Fransen, Joyce | --NR-- |
| 'Late Jewel' | Medium | Unknown | Light-Purple | August to September | Benedict, Dr Ralph (Herb) & Kuenster, Rod | .2010 |
| 'Late Purple' | Large | Unknown | - | - | Unknown | --NR-- |
| 'Later' | Medium | Unknown | - | - | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Laura' (Werner) | Miniature | Unknown | Med-Lavender | - | Werner, Klaus | --NR-- |
| 'Lavender Doll' | Large | Hybrid | Pale-Lavender | August | Sugita, Hajime & Ruh, Peter | .1998 |
| 'Lavender Dwarf' | Miniature | Unknown | Med-Lavender | - | Erb, Marsha Axmear | --NR-- |
| 'Lavender Lace' | Small | Unknown | - | - | Benedict, Dr Ralph (Herb) & Walek, Kevin | .2009 |
| 'Lavender Lady' | Small | Hybrid | Pale-Lavender | August | Williams, Frances & Williams, Connie | .1986 |
| 'Lavender Love' | Small | Unknown | - | - | Unknown | --NR-- |
| 'Lavisière' | Medium | Unknown | - | - | Inniswood Metro Gardens | --NR-- |
| 'Le Géant Beaupré' | Medium | Sport | Light-Purple | August | Bastille, Jocelyne | --NR-- |
| 'Le géant de Hollande' | Giant | Unknown | - | - | Montreal Botanical Garden | --NR-- |
| 'Le Patrimoine' | Miniature | Unknown | - | - | Bastille, Jocelyne | --NR-- |
| 'Leapin' Lizard' | Medium | Hybrid | - | August to September | Beilstein, Doug & Beilstein, Mardy | .2012 |
| 'Leather Gloss' | Medium | Sport | Pale-Lavender | August | Van Eechaute, Danny | --NR-- |
| 'Leather Sheen' | Medium | Hybrid | Light-Purple | July | Lohman, Doug & Zilis, Mark | .1988 |
| 'Leather Strap' | Small | Unknown | Light-Purple | July into August | Green Mountain Hosta | --NR-- |
| 'Leatherman' | Large | Unknown | - | - | Sanford, Matt | --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' | Miniature | Hybrid | - | - | Zilis, Mark | .2009 |
| 'Lenape' | Large | Hybrid | Pale-Lavender | July | Wade, Van | .2007 |
| 'Leon' | Medium | Unknown | Light-Purple | August | Simpers, Lucille & Ruh, Peter | .1995 |
| 'Leprechaun' | Miniature | Unknown | Light-Purple | July | Stone, David & Ruh, Peter | .1991 |
| 'Leprechaun's Lair' | Small | Unknown | Light-Purple | - | Moldovan, Steve | --NR-- |
| 'Les Appalaches' | Small | Unknown | Med-Lavender | - | Bastille, Jocelyne | --NR-- |
| 'Les Arpents Verts' | Giant | Unknown | - | - | Bastille, Jocelyne | --NR-- |
| 'Les Dents de la Mer' | Miniature | Unknown | Pale-Lavender | - | Bastille, Jocelyne | --NR-- |
| 'Let Me Entertain You' | Large | TC Sport | Pale-Lavender | July | Zilis, Mark | .2003 |
| 'Letha Mae' | Large | Unknown | Med-Lavender | July into August | Kuenster, Rod | .2006 |
| 'Lettuce Salad' | Large | Sport | Pale-Lavender | July | Postlewaite, Peter | .2008 |
| 'Libra' | Large | Unknown | - | June into August | Husemann, Jim | .2011 |
| 'Lighthouse' (Elslager) | Giant | Hybrid | Near-White | July | Elslager, Ed | .2003 |
| 'Lilac Love' | Medium | Unknown | Med-Lavender | July into August | Simpers, Lucille & Ruh, Peter | .1999 |
| 'L'Île d'Orléans' | Medium | Unknown | Near-White | - | Bastille, Jocelyne | --NR-- |
| 'Liliiflora' | Large | Sport | Pale-Lavender | July | Maekawa, Dr Fumio | --NR-- |
| 'Liliput' | Small | Unknown | Med-Lavender | June into July | Klose, Heinz | --NR-- |
| 'Lillie' | Miniature | Unknown | Light-Purple | July | Landis, Henry & Ruh, Peter | .1999 |
| 'Lily Pad' | Medium | Hybrid | Light-Purple | August | Solberg, Robert | .2000 |
| '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 Krinkles' | Medium | Hybrid | Near-White | July into August | Soules, Marjorie | .1988 |
| '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 |
| 'Lime Sours' | Miniature | Hybrid | Med-Lavender | June into July | Gilligan, Madelon | .2018 |
| 'Lime Tiara' | Medium | TC Sport | Light-Purple | July into August | Zilis, Mark | .2011 |
| 'Lime Time' | - | Unknown | - | - | Unknown | --NR-- |
| 'Lime Zest' | Miniature | Hybrid | Light-Purple | August | Zilis, Mark | .2009 |
| 'Limelighter's Glow' | Large | Unknown | Pale-Lavender | - | Minks, Eldren & Malloy, Alex | .2000 |
| 'Limestone Lover' | Medium | Hybrid | Near-White | August to October | Schulz, Ed | .2002 |
| 'Limetini' | Small | Hybrid | Light-Purple | August to September | Zilis, Mark | .2009 |
| 'Limey Lisa' | Small | Hybrid | Light-Purple | July | Zumbar, Wm & Walek, Kevin | .2009 |
| 'Limited Edition' | Medium | Hybrid | Pale-Lavender | June | Kamp, Gayle | .2001 |
| 'Limoges' | - | Unknown | Med-Lavender | - | Davidson, LeRoy | --NR-- |
| 'Limon' | Large | Unknown | Med-Lavender | June | Sellers, Van | .1983 |
| 'Limoncello' | Small | Unknown | - | - | Dalton, Jim & Dalton, Meg | --NR-- |
| 'Lindsay Strub' | Large | Hybrid | - | - | Zilis, Mark | --NR-- |
| 'Lion Island' | Small | Sport | - | - | Schwarz, Jim | --NR-- |
| 'Lisa Marie' | Medium | Hybrid | Med-Lavender | June into July | Livingston, Ron | --NR-- |
| 'Lisa Pauline Nash' | Medium | Unknown | - | - | Nash, Bill | --NR-- |
| 'Little Big Man' | Medium | Unknown | - | - | Unknown | --NR-- |
| 'Little Bit' | Small | Sport | Light-Purple | July | Malloy, Alex | .1999 |
| 'Little Black Scape' | Medium | Hybrid | Light-Purple | July | Avent, Tony | .1995 |
| 'Little Blue' | Medium | Hybrid | Light-Purple | July into August | Englerth, Lawrence | .1976 |
| 'Little Dancer' | Miniature | Hybrid | Pale-Lavender | July into August | Van Eechaute, Danny | .2013 |
| 'Little Dart' | Small | Sport | Light-Purple | August | Fisher, Eunice V. & Ruh, Peter & Lydell, Ransom | .1995 |
| 'Little Early Bird' | Medium | Hybrid | - | - | Fisher, Eunice V. | --NR-- |
| 'Little Fellow' | Miniature | Hybrid | Pale-Lavender | July | Owens, Clarence | .1990 |
| 'Little Green Griffonage' | Small | Hybrid | Pale-Lavender | June into July | Chamberlain, Steve | .2005 |
| 'Little Hobber' | Small | Unknown | Pale-Lavender | July | Terpening, Kent | .2001 |
| '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 |
| 'Little Miss Muffett' | Miniature | Unknown | Med-Lavender | June into July | Zumbar, Wm | --NR-- |
| 'Little One' | Small | TC Sport | Light-Purple | July | Zilis, Mark | --NR-- |
| 'Little Pan' | Small | Hybrid | - | - | Fischer, Dr Ullrich | --NR-- |
| 'Little Petite' | Small | Unknown | - | - | Unknown | --NR-- |
| 'Little Picture' | Small | Hybrid | - | - | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Little Princess' | Miniature | Unknown | - | - | Wade, Van & Walek, Kevin | .2009 |
| 'Little Ralph' | Small | Unknown | Pale-Lavender | July | Stever, Ralph & Hendrickson, Bob | .2002 |
| 'Little Red Joy' | Small | Hybrid | Pale-Lavender | August | Van Eechaute, Danny | .2004 |
| 'Little Red Rooster' | Small | Hybrid | Pale-Lavender | - | Van Eechaute, Danny | .2002 |
| 'Little Red Wagon' | Small | Unknown | - | - | Livingston, Ron | --NR-- |
| 'Little Redneck' | Miniature | Hybrid | Pale-Lavender | June into July | Avent, Tony | --NR-- |
| 'Little Sheen' | Large | Hybrid | Med-Lavender | July into August | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Little Slam Bang' | Large | Unknown | - | August to September | Benedict, Dr Ralph (Herb) & Kuenster, Rod | .2010 |
| 'Little Tyke' | Small | Unknown | - | - | Wade, Van | --NR-- |
| 'Little Wiggler' | Miniature | Unknown | Light-Purple | August | Lachman, Wm & Lachman, Eleanor | .2005 |
| 'Littlechap' | Miniature | Hybrid | Light-Purple | June into July | Johnson, Greg | .2004 |
| 'Live Wire' | Small | Hybrid | - | August to September | Beilstein, Doug & Beilstein, Mardy | .2009 |
| 'Liverpool White' | Large | Sport | - | - | Unknown | --NR-- |
| 'Livonia' | Medium | Unknown | Deep-Purple | August | Klose, Heinz & Krossa, Gus & Ruh, Peter | .1998 |
| 'Lizard Lick' | Medium | Hybrid | Pale-Lavender | July | Franks, Richard & Solberg, Robert | .2007 |
| 'Lizz' | Small | Unknown | - | - | Plater-Zyberk, Maria | --NR-- |
| 'Locksmith' | Giant | Hybrid | Near-White | - | Gilligan, Madelon | .2012 |
| 'Logan' | Large | Hybrid | - | June into July | Kwick, Charles | .2016 |
| 'Long Green Dress' | Medium | Unknown | - | - | Smith, Roger | --NR-- |
| 'Long Tom' | Large | Hybrid | Pure-White | August | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Longboats' | Medium | Unknown | - | - | Lydell, Ransom | --NR-- |
| 'Lord Brendan' | Medium | Hybrid | Pale-Lavender | July into August | Kwick, Charles | .2017 |
| 'Lord Rock' | Medium | Hybrid | Pale-Lavender | June | Wade, Van | .2007 |
| 'Loretta's Lavender' | Medium | Unknown | Med-Lavender | August to September | Schulz, Ed | .2005 |
| 'Lorna' | Small | Hybrid | Light-Purple | July | Benedict, Dr Ralph (Herb) | .1983 |
| 'Lost World' | Medium | Hybrid | Med-Lavender | June into July | Goodwin, Randy | .2003 |
| 'Lothar the Giant' | Large | Unknown | - | - | Balitewicz, Bob | --NR-- |
| '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 |
| 'Louie' | Miniature | Unknown | Light-Purple | August | Missouri Botanical Garden & Ruh, Peter | .1996 |
| 'Louis Cyr' | Large | Unknown | Med-Lavender | July | Fafard, Serge | --NR-- |
| 'Louise Strub' | Medium | Hybrid | - | - | Zilis, Mark | --NR-- |
| 'Love Song' | Large | Hybrid | - | July into August | Van Eechaute, Danny | .2010 |
| 'Lovin' Spoonful' | Miniature | Hybrid | Pale-Lavender | June into July | Avent, Tony | .2007 |
| 'Lucille' | Medium | Hybrid | Pale-Lavender | July | Kuk, Bob | .2001 |
| 'Lucky Charm' | Large | Hybrid | Med-Lavender | July | Fisher, Eunice V. & The American Hosta Society | .1986 |
| 'Lucy' | Large | Hybrid | Med-Lavender | - | Housworth, Jere | --NR-- |
| 'Lucy's Crinkles' | Large | Hybrid | Near-White | July | Banyai, Pauline | .1991 |
| 'Lunar Night' | Medium | Sport | Pale-Lavender | July | Lydell, Ransom | .1998 |
| 'Lush Life' | Small | Hybrid | - | - | Ward, Dr Dick & Ward, Jane | .2012 |
| 'Lusty Mae' | Large | Unknown | - | - | Scheer, Alttara | --NR-- |
| 'Lynn Weissenberger' | Small | Unknown | - | - | Weissenberger, Henry | --NR-- |
| 'Lytton Strachey' | Small | Unknown | - | - | Crockett, Clyde | --NR-- |
|