| Medial (Center) Variegation | Plant Size | Leaf Color | Var Color | Origin | Season | Source | Registered |
| 'Madame Butterfly' (Gowen) | Medium | Dark-Green | Yellow | Hybrid | July | Gowen, Hideko | .1999 |
| 'Made in Spades' | Small | Med-Green | Yellow | Sport | July | Van Eechaute, Danny & Fransen, Marco & Fransen, Joyce | --NR-- |
| 'Mademoiselle' | Small | Med-Green | White | Sport | July | Klehm, Roy | .1999 |
| 'Magna Carta' | Small | Med-Green | White | Sport | July | Bennerup, Pierre & Malloy, Alex | .2001 |
| 'Maiohgi' | Medium | Med-Green | Yellow | Sport | July | Unknown | --NR-- |
| 'Mama Blue' | - | Blue/Green | White | Unknown | - | Goodwin, Randy | --NR-- |
| 'Manfred's Parfait' | Medium | Med-Green | White | Unknown | - | Mondt, Manfred | --NR-- |
| 'Mango Tango' | Large | Med-Green | Yellow | Sport | July | Kinman, Eric | .2007 |
| 'Manzo' | Small | Med-Green | White | Sport | September to October | Unknown | --NR-- |
| 'Marble Eye' | Small | Med-Green | White | Unknown | - | Heemskerk, Gerardus | --NR-- |
| 'Marble Queen' | - | Med-Green | Yellow | Sport | - | Unknown | --NR-- |
| 'Marbled Cream Elite' | Medium | Dark-Green | White | Sport | July | Owens, Clarence | .1999 |
| 'Marcella' | Small | Med-Green | White | Hybrid | August | Schulz, Ed | .2002 |
| 'Margie's Angel' | Medium | Dark-Green | Yellow | Hybrid | June | Solberg, Robert | .2007 |
| 'Marion Bachman' | Large | Dark-Green | Yellow | Sport | July | Bachman, Lloyd | .1992 |
| 'Mark Anthony' | Large | Med-Green | Yellow | Hybrid | June into July | Johnson, Greg | .2004 |
| 'Marla' | Small | Dark-Green | Yellow | Sport | July | Courtney, Donna | .2003 |
| 'Marmalade on Toast' | Large | Dark-Green | Yellow | Sport | July into August | Fransen, Marco & Fransen, Joyce | --NR-- |
| 'Marnie's Delight' | Medium | Dark-Green | Yellow | Unknown | July into August | Kuenster, Rod | .2006 |
| 'Marquee' | Medium | Blue/Green | Yellow | Unknown | - | Laviana, Marc | --NR-- |
| 'Marshmallow Sky' | Medium | Med-Green | White | Sport | July | Fransen, Marco & Fransen, Joyce | --NR-- |
| 'Mary Marie Ann' | Small | Blue/Green | White | Hybrid | July into August | Englerth, Lawrence | .1982 |
| 'Mary Scholl' | Large | Med-Green | Yellow | Sport | June | Lamlein, Robert | .1999 |
| 'Masked Marvel' | Medium | Dark-Green | White | Sport | July into August | Malloy, Alex | --NR-- |
| 'Masquerade' | Small | Med-Green | White | Hybrid | June into July | Grenfell, Diana & Walek, Kevin | .2009 .2018 |
| 'Mata Hari' | Large | Dark-Green | White | Sport | July into August | Strandberg, Mark | --NR-- |
| 'Matrix' | Small | Med-Green | White | TC Sport | July | Zilis, Mark | .2003 |
| 'Maya' | Small | Dark-Green | Light Green | Sport | July into August | Meissner, O. & Ruh, Peter | .1996 |
| 'Mayday' | Small | Light-Green | White | Unknown | - | Unknown | --NR-- |
| 'Mayville' | Medium | Blue/Green | Yellow | Sport | July | Ruh, Peter | .2003 |
| 'Me and My Shadow' | Medium | Blue/Green | Green | TC Sport | July | Schwarz, Jim | .2003 |
| 'Medusa' | Miniature | Med-Green | Yellow | Hybrid | August | Herold, Roy | .1993 |
| 'Meike' | Small | Dark-Green | White | Unknown | - | Unknown | --NR-- |
| 'Mellow Mood' | Medium | Dark-Green | White | Sport | July into August | Strandberg, Mark | --NR-- |
| 'Memphis Blues' | Small | Med-Green | Yellow | Unknown | - | Petryszyn, Olga | --NR-- |
| 'Merry Christmas' | Medium | Dark-Green | Yellow | TC Sport | July | Zilis, Mark | .2003 |
| 'Merry Men' | Small | Dark-Green | Yellow | Unknown | July | Schwarz, Jim | .2002 |
| 'Mid Afternoon' | Large | Dark-Green | Yellow | TC Sport | July into August | Anderson, Jim | --NR-- |
| 'Midlife Crisis -Tummy Tuck' | Small | Blue/Green | Yellow | TC Sport | July into August | Wilson, Glenn | --NR-- |
| 'Midnight at the Oasis' | Medium | Dark-Green | White | Sport | July into August | Naylor Creek Nursery & The American Hosta Society | .2019 |
| 'Midori-no-ya' | Medium | Dark-Green | Green | Sport | September | Van Eechaute, Danny | .2004 |
| 'Mieke' | Small | Med-Green | Yellow | Unknown | - | Dupre, Dirk | --NR-- |
| 'Mighty Finn' | Large | Dark-Green | White | Hybrid | June into July | Beilstein, Doug & Beilstein, Mardy | .2018 |
| 'Mighty Moe' | Small | Dark-Green | White | Sport | June into July | Silvers, Bill | .2009 |
| 'Mighty Moe Supreme' | Miniature | Med-Green | White | Sport | June into July | Wade, Van | .2015 |
| 'Milky Way' (Unknown) | Medium | Med-Green | White | Unknown | - | Unknown | --NR-- |
| 'Million Dollar Baby' | Large | Blue/Green | Yellow | Hybrid | July into August | Elslager, Ed | .2005 |
| 'Mini Edged' | Miniature | Med-Green | Yellow | Unknown | - | Unknown | --NR-- |
| 'Mini Face' | Small | Dark-Green | White | TC Sport | July | Anderson, Jim | --NR-- |
| 'Mini Man' | Small | Dark-Green | White | TC Sport | July | Anderson, Jim | --NR-- |
| 'Minnesota Nice' | Medium | Dark-Green | Yellow | Sport | July | Snyder, Ron | .1997 |
| 'Minnesota Weather' | Small | Med-Green | White | Sport | July into August | Kiehne, Myrtle | .1980 |
| 'Minted Gold' | - | Med-Green | Yellow | Unknown | - | Banyai, Pauline | --NR-- |
| 'Mirage' (Livingston) | Large | Yellow | Green | Hybrid | - | Livingston, Ron | --NR-- |
| 'Mishima Fukurin Koba' | Small | Med-Green | White | Sport | August | Unknown | .2009 .2018 |
| 'Miss America' (Hansen) | Large | Med-Green | White | Hybrid | July into August | Hansen, Hans & Walters Gardens | .2018 |
| 'Miss Christa' | Medium | Med-Green | White | Nat-Sport | July | Van den Top, Jan | --NR-- |
| 'Miss Halley' | Medium | Blue/Green | Yellow | Sport | July into August | Jones, Leonard | .2003 |
| 'Miss Missey' | Medium | Med-Green | White | Sport | August | Wrede, Arthur | .2006 |
| 'Mister Twister' | Small | Med-Green | White | Sport | July into August | Lysne, Rod | --NR-- |
| 'Misty Regal' | Giant | Med-Green | Yellow | Sport | July | Stratton, John & Stratton, Elizabeth | .1996 |
| 'Misty Ridge' | Medium | Dark-Green | White | Unknown | - | Schmidt, Bevie | --NR-- |
| 'Mixed Nuts' | Small | Blue/Green | Yellow | Sport | July into August | Plemmons, Chuck | --NR-- |
| 'Miyazaki' | Small | Med-Green | White | Hybrid | August to September | Zilis, Mark | .2010 |
| 'MonChard' | Miniature | Med-Green | Yellow | Unknown | July | Monrovia Nursery | --NR-- |
| 'Monet' (Zilis) | Small | Blue/Green | Green | TC Sport | July into August | Zilis, Mark | .2011 |
| 'Monkey Trail' | Medium | Med-Green | Green | Unknown | | Van den Top, Jan | --NR-- |
| 'Montana Moonshine' | Giant | Yellow | Blue-Green | Unknown | | Anderson, Jim | --NR-- |
| 'Monument Circle' | Medium | Light-Green | White | Nat-Sport | June into July | Crockett, Clyde | .1995 |
| 'Moon Split' | Medium | Light-Green | Dark Green | Sport | July into August | Van Eechaute, Danny | .2010 |
| 'Moonlight Fog' | Miniature | Med-Green | White | Unknown | - | Unknown | --NR-- |
| 'Moonstone' | Large | Dark-Green | White | Unknown | - | Dalton, Jim & Dalton, Meg | --NR-- |
| 'Moonstruck' | Small | Blue/Green | White | Sport | August | Zumbar, Wm & Walek, Kevin | .2009 |
| 'Morinji Nishiki' | - | Med-Green | White | Unknown | - | Unknown | --NR-- |
| 'Morning Light' | Medium | Med-Green | White | Sport | July into August | Van Eijk-Bos, Gert & Van Erven, Dirk | .2000 .2016 |
| 'Mostly Green' | Large | Med-Green | Yellow | Sport | June into July | Summers, Alex | --NR-- |
| 'Moulin Rouge' | Medium | Dark-Green | White | Sport | July into August | Van Eechaute, Danny | .2010 |
| 'Mountain Fog' | Small | Med-Green | White | Unknown | - | Unknown | --NR-- |
| 'Mouse Trap' | Small | Blue/Green | White | Sport | - | Hansen, Hans & Shady Oaks Nursery | --NR-- |
| 'Mouseketeer' | Small | Blue/Green | Yellow | Hybrid | | Hansen, Hans 1950 1960 | .2021 |
| 'Mr. Dillon' | Small | Dark-Green | Yellow | Unknown | - | Westberg, Jim | --NR-- |
| 'Mrs. Cleaver' | Large | Blue/Green | Green | Unknown | | Hicks, Gerry | --NR-- |
| 'Mutley's Rest' | Large | Blue/Green | Yellow | Sport | June into July | Orlando, John | .2001 |
| 'My Child Insook' | Medium | Med-Green | White | Sport | July into August | Benedict, Dr Ralph (Herb) & Benedict, Dorothy | .1995 |
| 'My Heroes' | Medium | Blue/Green | White | Sport | June | Chopko, Dave | --NR-- |
| 'My Laura' | Large | Med-Green | Yellow | Unknown | June into July | Schwarz, Jim | .2010 |
| 'My Maria' | Small | Dark-Green | White | Sport | July into August | Sebright Gardens | .2018 |
| 'My Passion' | Large | Dark-Green | White | Sport | July into August | Schembs, Michael | --NR-- |
| 'Myerscough Magic' | Large | Blue/Green | White | Sport | June into July | Bowden, Roger | --NR-- |
| 'Myland' | Medium | Light-Green | White | Unknown | - | Unknown | --NR-- |
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