| Rating | Plant | Thumbnail |
| Decorative Dahlia 'Maaike'
Dahlia | |
| Formal Decorative Dahlia 'Maarn'
Dahlia |  |
| Cactus Dahlia 'Macalister's Pride'
Dahlia |  |
| Formal Decorative Dahlia 'Madame Simone Stappers'
Dahlia
Additional info: (aka Madame Stappers) | |
 | Waterlily Dahlia 'Maddisen Jane'
Dahlia |  |
| | Decorative Dahlia 'Magic Moment'
Dahlia
Hybridized by Connell, 1983 |  |
| Formal Decorative Dahlia 'Magically Dun'
Dahlia |  |
| Informal Decorative Dahlia 'Maisie Mooney'
Dahlia
Hybridized by Mooney, 1994 |  |
| Informal Decorative Dahlia 'Maki'
Dahlia
Hybridized by Gingaen, 1980 |  |
| Waterlily Dahlia 'Malaysia'
Dahlia
Additional info: (aka Dalina® Midi series) |  |
| | Formal Decorative Dahlia 'Maltby Pearl'
Dahlia |  |
| Semi Cactus Dahlia 'Mango Sunset'
Dahlia |  |
| Semi Cactus Dahlia 'Maniac'
Dahlia |  |
| Decorative Ball Dahlia 'Marble Ball'
Dahlia
Hybridized by Stowell, 1974 | |
| Ball Dahlia, Decorative Dahlia 'Mardy Gras'
Dahlia |  |
| Formal Decorative Dahlia 'Margaret Duross'
Dahlia |  |
| Waterlily Dahlia 'Margaret Ellen'
Dahlia |  |
| | Dwarf Dahlia 'Margaret Improved'
Dahlia
Hybridized by Gitzels, 2002
Additional info: (PP14202, Royal Dahlietta™ Series) |  |
| Decorative Dahlia 'Mariana'
Dahlia
Additional info: (aka Dalina® Midi series) | |
| Novelty Dahlia, Orchid Dahlia 'Marie Schnugg'
Dahlia |  |
| Dahlia 'Mark Lockwood'
Dahlia | |
| Dahlia 'Maroen'
Dahlia | |
| Ball Dahlia 'Maroon Fox'
Dahlia
Hybridized by Verwer, 2006 |  |
| Decorative Dahlia 'Martina'
Dahlia
Hybridized by Geerlings, 2004 |  |
| Dahlia 'Marvelous Mans'
Dahlia |  |
| | Chrysanthemum Dahlia 'Mary'
Dahlia |  |
| Collarette Dahlia 'Mary Eveline'
Dahlia
Hybridized by Chambers, 1987 |  |
| | Novelty Collarette Dahlia 'Mary Evelyn'
Dahlia |  |
| | Semi Cactus Dahlia 'Mary Jo'
Dahlia
Hybridized by Franz, 1968 |  |
| Pompon Dahlia 'Mary Munns'
Dahlia |  |
| Ball Dahlia 'Mary's Jomanda'
Dahlia |  |
| Decorative Dahlia 'Maryland'
Dahlia
Hybridized by Ruigrok, 1999
Additional info: (PP11602, Dahlinova® series) | |
| Semi-Cactus Dahlia 'Match'
Dahlia
Hybridized by Hindry, 1965 |  |
| Dahlia 'Matchmaker'
Dahlia |  |
| Semi Cactus Dahlia 'Mathew Alan'
Dahlia | |
| Cactus Dahlia 'Matilda Huston'
Dahlia |  |
| Single Flowered Border Dahlia 'Matthew Juul'
Dahlia |  |
| Waterlily Dahlia 'Mauritius'
Dahlia
Hybridized by Knudsen, 2004
Additional info: (PP16352, aka Dalina® Midi series) | |
| Decorative Dahlia 'Maxime'
Dahlia
Hybridized by Bal, 2002 | |
| Decorative Dahlia 'Maya'
Dahlia
Hybridized by Verwer, 1986 |  |
