| Cultivar Name | Plant Size | Origin | Flower Color | Season | Source | Registered |
| 'La Grande Bouffe' | Giant | Hybrid | Pale-Lavender | - | Bastille, Jocelyne | --NR-- |
| 'La Vita è Bella' | Large | Hybrid | Near-White | - | Bastille, Jocelyne | --NR-- |
| 'Lac Leman' | Medium | Hybrid | Pale-Lavender | August to September | Hirsbrunner, Liselotte | .2001 |
| 'Ladies Choice' | - | Hybrid | - | - | Housworth, Jere | --NR-- |
| 'Lady in Blue' | Medium | Hybrid | Near-White | June into July | Ward, Dr Dick & Ward, Jane | .2012 |
| 'Lady in Waiting' | Large | Hybrid | Near-White | July | Arett, Anne | .1980 |
| 'Lahn' | Small | Unknown | Pale-Lavender | August | Klose, Heinz & Ruh, Peter & Ruh, Jean | .2005 |
| 'Lake Arrowhead' | Large | Unknown | - | - | Tompkins, Chet | --NR-- |
| 'Lake Gitchigumi' | Giant | Hybrid | Near-White | July into August | Petryszyn, Olga | --NR-- |
| 'Lake Louise' | Large | Hybrid | Near-White | June into July | Minks, Eldren | .1975 |
| 'Lake Superior' | Giant | Hybrid | Pure-White | July | Chastain, Mary & Lydell, Ransom | .2001 |
| 'Lake Wales' | Giant | Hybrid | - | - | Purvis, Owen & Purvis, Sue | --NR-- |
| 'Lake Wasilla' | Large | Unknown | - | - | Wade, Van | --NR-- |
| 'Lakeport Babe' | Large | Hybrid | - | - | Tompkins, Chet | --NR-- |
| 'Lakeport Blue' | Large | Unknown | Near-White | June | Tompkins, Chet | .1984 |
| 'Lakeside Beach Bum' | Medium | Unknown | Near-White | July | Chastain, Mary | .2001 |
| 'Lakeside Big Scoop' | Medium | Unknown | Light-Purple | July | Chastain, Mary | .2002 |
| 'Lakeside Blue Cherub' | Medium | Sport | Pale-Lavender | July | Chastain, Mary | .1991 |
| 'Lakeside Blue Confusion' | Medium | Hybrid | Pure-White | June into July | Chastain, Mary | .1998 |
| 'Lakeside Blue Jeans' | Large | Unknown | Pale-Lavender | July | Chastain, Mary | .2003 |
| 'Lakeside Blue Sophistication' | Large | Sport | Pale-Lavender | July | Chastain, Mary | --NR-- |
| 'Lakeside Color Blue' | Large | Hybrid | Pure-White | June into July | Chastain, Mary | .2003 |
| 'Lakeside Foot Prints' | Medium | Unknown | - | - | Chastain, Mary | --NR-- |
| 'Lakeside Indigo Go' | - | Unknown | Near-White | - | Chastain, Mary | --NR-- |
| 'Lakeside Iron Man' | Medium | Unknown | Pale-Lavender | July | Chastain, Mary | .2003 |
| 'Lakeside It's Colorific' | Medium | Hybrid | - | - | Chastain, Mary | --NR-- |
| 'Lakeside King Pin' | Giant | Hybrid | Pure-White | June | Chastain, Mary | .2006 |
| 'Lakeside Lagoon' | Large | Hybrid | Near-White | July into August | Chastain, Mary | .1998 |
| 'Lakeside Magnetic Force' | Large | Hybrid | Pure-White | June into July | Chastain, Mary | .2006 |
| 'Lakeside Main Man' | Large | Hybrid | Pale-Lavender | July | Chastain, Mary | .2002 |
| 'Lakeside Old Smokey' | Medium | Hybrid | Pale-Lavender | July | Chastain, Mary | .2004 |
| 'Lakeside Pebbles' | Medium | Unknown | Near-White | June into July | Chastain, Mary | .1995 |
| 'Lakeside Sapphire Pleats' | Medium | Unknown | Near-White | June | Chastain, Mary | .1996 |
| 'Lakeside Tycoon' | Large | Sport | Pale-Lavender | July into August | Chastain, Mary | .2002 |
| 'Lakeside Un Huh' | Giant | Unknown | Near-White | June into July | Chastain, Mary | .2004 |
| 'Lakeside Whispering Leaves' | Giant | Hybrid | Med-Lavender | June | Chastain, Mary | .2005 |
| 'Lamppost Blue' | Large | Hybrid | Pale-Lavender | July into August | Stegeman, Bev & Stegeman, Dave | --NR-- |
| 'Landfall' | Giant | Unknown | - | - | Sawyer, Rick | --NR-- |
| 'Landscape One' | Small | Unknown | - | June into July | Lighty, Richard | .2009 |
| 'Lap Dance' | Miniature | Hybrid | Light-Purple | June into July | Johnson, Greg | .2004 |
| 'Lauman Blue' | Large | Unknown | Near-White | July | Lauman | --NR-- |
| 'Lauman Garden Blue' | Large | Unknown | Pale-Lavender | July | Lauman & Ruh, Peter | .2002 |
| 'Laura Z' | Small | Unknown | - | - | Kohlein, Fritz | --NR-- |
| 'Lauren's Delight' | Medium | Unknown | - | June into July | Ward, Dr Dick & Ward, Jane | .2005 |
| 'Lavender Stocking' | Large | Hybrid | Pale-Lavender | August | Sugita, Hajime & Ruh, Peter | .1998 |
| 'Leather Angel' | Large | Unknown | Near-White | - | Henjum, Paul | --NR-- |
| 'Leather Coat' | Small | Sport | Near-White | June into July | Snyder, Ron | .1995 |
| 'Leatherneck' | Giant | Hybrid | Pale-Lavender | - | Nyikos, Frank | .1998 |
| 'Lederhosen' | Medium | Unknown | Light-Purple | June into July | Benedict, Dr Ralph (Herb) & Benedict, Dorothy & Kuenster, Rod | .2010 |
| 'Lee Armiger' | Giant | Hybrid | Near-White | June | Reath, David | .1986 |
| 'Legacy of Corydon' | Large | Hybrid | Med-Lavender | July into August | Kwick, Charles | .2017 |
| 'Lehman's Blue' | - | Unknown | - | - | Lehman, Dick | --NR-- |
| 'Lela's Quilt' | Large | Hybrid | Pale-Lavender | June into July | Hackbarth, Robert | .2015 |
| 'L'ennemi' | Medium | Unknown | Med-Lavender | June into July | Bastille, Jocelyne | --NR-- |
| 'Les Noces d'Argent' | Giant | Unknown | Near-White | June | Bastille, Jocelyne | --NR-- |
| 'Lespedeza Gibralter' | Large | Unknown | - | - | Unknown | --NR-- |
| 'Leviathan' | Giant | Hybrid | Near-White | June into July | Nesmith, Elizabeth & The American Hosta Society | .1986 |
| 'Lilac Giant' | Giant | Hybrid | Pale-Lavender | June into July | Hensen, Karel & Verboom | .1983 |
| 'Lily Blue Eyes' | Small | Hybrid | Pale-Lavender | July into August | Donsky, George | .2007 |
| 'Linda Blue' | Giant | Unknown | Pure-White | June into July | Wogoman, Gene | .2007 |
| 'Linde' | Medium | Hybrid | - | June into July | Hofer, Paul & Ruh, Peter | .1983 |
| 'Little Boy' | Large | Hybrid | Pure-White | June into July | Nyikos, Frank | .2001 |
| 'Little Boy Blue' | Large | Sport | Pure-White | June into July | Nyikos, Frank | .2001 |
| 'Little Brother' | Large | Hybrid | Pale-Lavender | July into August | Nyikos, Frank | .2008 |
| 'Little Dipper' | Medium | Unknown | Pale-Lavender | June into July | Ward, Dr Dick & Ward, Jane | .2005 |
| 'Little Jack Frost' | Medium | Unknown | Pale-Lavender | August to September | Benedict, Dr Ralph (Herb) & Benedict, Dorothy & Kuenster, Rod | .2010 |
| 'Little John' | Large | Hybrid | Near-White | June into July | Schwarz, Jim | .2000 |
| 'Little Slam' | Small | Hybrid | - | - | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Little Wedge' | Medium | Unknown | Light-Purple | August | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Lochness' | Large | Hybrid | Near-White | June into July | Lachman, Wm & Lachman, Eleanor | .1988 |
| 'Lochness Blue' | Large | Sport | Near-White | June into July | Brill, Kirk | .1999 |
| 'Locomotion' | Medium | Hybrid | Light-Purple | August | Krul, Nancy & Belle Gardens | .1993 |
| 'Lonesome and Blue' | Medium | Unknown | Pale-Lavender | July into August | Benedict, Dr Ralph (Herb) | --NR-- |
| 'Longiana Blue' | Medium | Hybrid | - | - | Solberg, Robert | --NR-- |
| 'Longjohn' | Medium | Hybrid | Pale-Lavender | July | Woodford, R. | .2000 |
| 'Lost at Sea' | Medium | Hybrid | Pale-Lavender | August to October | Hansen, Hans | .2003 |
| 'Lotsa Love' | Large | Hybrid | - | - | Skaggs, Virginia & Skaggs, Brian | --NR-- |
| 'Love Bubble' | Medium | Unknown | Near-White | June into July | Unknown | --NR-- |
| 'Love Bug' | Small | Hybrid | Light-Purple | July | Malloy, Alex | .2001 |
| 'Love Nest' | Medium | Hybrid | Pale-Lavender | July | Ward, Dr Dick & Ward, Jane | .2004 |
| 'Love Pat' | Large | Hybrid | Pale-Lavender | - | Shaw, Florence & Aden, Paul | .1978 |
| 'Love Tap' | Large | Hybrid | Near-White | June into July | Woods, Doyle & Schulz, Ed | .2013 |
| 'Loving Cup' | Large | Hybrid | - | - | Armstrong, Maxine | .1970 |
| 'Lucille Simpers' | Giant | Unknown | Pale-Lavender | July | Pope, Irene & Harstad, Carolyn | .1990 |
| 'Lucy and Ethel' | Large | TC Sport | Near-White | June into July | Zilis, Mark | .2009 |
| 'Lynne' | Medium | Hybrid | Pale-Lavender | June into July | Weissenberger, Henry | .1986 |
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