| Cultivar Name | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| 'Made from Scratch' | Medium | Med-Green | Marginal | White | Hybrid | Pale-Lavender | July | Asch, Stuart | .2005 |
| 'Manfred's Parfait' | Medium | Med-Green | Medial | White | Unknown | - | - | Mondt, Manfred | --NR-- |
| 'Mango Salsa' | Medium | Light-Green | - | - | Hybrid | Pale-Lavender | - | Solberg, Robert | .2011 |
| 'Mango Smoothie' | Medium | Yellow | - | - | Sport | Pale-Lavender | July | Fransen, Marco & Fransen, Joyce | --NR-- |
| 'Mango Tango' | Large | Med-Green | Medial | Yellow | Sport | Pale-Lavender | July | Kinman, Eric | .2007 |
| 'Maraschino Cherry' | Medium | Med-Green | - | - | TC Sport | Light-Purple | July into August | Zilis, Mark | .1999 |
| 'Marbled Cream' | Small | Med-Green | Streaked | Speckles | Hybrid | Pale-Lavender | July | Owens, Clarence | .1985 |
| 'Marbled Cream Elite' | Medium | Dark-Green | Medial | White | Sport | Pale-Lavender | July | Owens, Clarence | .1999 |
| 'Marmalade on Toast' | Large | Dark-Green | Medial | Yellow | Sport | Pale-Lavender | July into August | Fransen, Marco & Fransen, Joyce | --NR-- |
| 'Martini' | Small | Med-Green | - | - | Hybrid | Light-Purple | July | Zilis, Mark | .2009 |
| 'Mellow Yellow' | Large | Yellow-Gold | - | - | Unknown | Near-White | July into August | Benedict, Dr Ralph (Herb) | .2010 |
| 'Merna's Lemon Piecrust' | Large | Yellow | - | - | Unknown | - | - | Nash, Bill | --NR-- |
| 'Michael's Mud Pie' | Large | Med-Green | - | - | Unknown | - | June | Markland, Sandie | .2002 |
| 'Michigan Honey' | Small | Med-Green | Marginal | Yellow | Unknown | - | - | Unknown | --NR-- |
| 'Milk and Honey' | Large | Med-Green | Marginal | White | Sport | Pale-Lavender | August to September | Lynch, P. | .2003 |
| 'Milk Road' | Large | Blue/Green | - | - | Sport | Near-White | June into July | Van den Top, Jan | --NR-- |
| 'Milkshake' | Medium | Dark-Green | Streaked | Yellow | Hybrid | - | - | Meyer, Bill | --NR-- |
| 'Milky Way' (Unknown) | Medium | Med-Green | Medial | White | Unknown | - | - | Unknown | --NR-- |
| 'Milky Way' (Van Ostrand) | Medium | Med-Green | Streaked | Speckles | Unknown | - | - | Van Ostrand, John | --NR-- |
| 'Milky Way' (Wade) | Large | Dark-Green | Streaked | White | Unknown | - | - | Wade, Van | --NR-- |
| 'Mint Candy' | Medium | Med-Green | Marginal | White | Hybrid | - | - | Lydell, Ransom | --NR-- |
| 'Mint Chip' | Medium | Med-Green | - | - | Hybrid | Pale-Lavender | June into July | Shadrack, Mike | .2011 |
| 'Mint Condition' (Zumbar) | - | - | - | - | Unknown | - | - | Zumbar, Wm | --NR-- |
| 'Mint Julep' | Large | Med-Green | Marginal | White | Hybrid | Light-Purple | July | Malloy, Alex | .2000 |
| 'Mint Mound' | Large | Dark-Green | - | - | Unknown | Light-Purple | July | Tompkins, Chet | --NR-- |
| 'Mint Tea' | Small | Light-Green | Marginal | White | Hybrid | - | - | Goodenough, Rick | --NR-- |
| 'Moldy Muffins' | Medium | Med-Green | - | - | Sport | Med-Lavender | July | Schwarz, Jim | --NR-- |
| 'Money Honey' | Medium | Yellow | - | - | Unknown | - | July into August | Malloy, Alex | .2003 |
| 'Mountain Dew' | Medium | Yellow | Marginal | White | TC Sport | Pale-Lavender | July | Zilis, Mark | .2003 |
| 'My Cup of Tea' | Medium | Yellow | - | - | Hybrid | Pale-Lavender | July | Elslager, Ed | .2002 |
|