| Cultivar | Group | Type | Hardy | Color | Bloom Time | |
|---|---|---|---|---|---|---|
|
‘Maarten van der Giessen’ | Stewart | evg | Zone 7, at least | Early Midseason | |
|
Mackenzie Green | Strickland | dec | Orange | Early | |
| Macopin | Nearing | lep | -20°F | Lavender | Early Midseason | |
|
Macrantha Double Pink | R. indicum | evg | Zone 7, at least | Late | |
|
Macrantha Dwarf | R. indicum | evg | Pink,Yellow | ||
|
Macrantha Purple
(Purple Gumpo) | R. indicum | evg | Purple | Late | |
| Madame Alphonse Pericat
(Madame Pericat) | Pericat | evg | ||||
|
‘Madame Mab Chalon’ | Robin Hill | evg | -5 F | Pink,White | Late Midseason |
| Madame Pericat | Pericat | evg | Pink,Purple | |||
|
Madcap | Glenn Dale | evg | |||
|
Madeira | Glenn Dale | evg | |||
|
‘Madeline Cosby’ | Klimavicz | evg | Zone 7 | Early Midseason | |
|
‘Mademoiselle Gigi’ | McDonald | evg | Zone 7 | Midseason | |
|
‘Mademoiselle Yvette’ | McDonald | evg | Midseason | ||
|
Madrigal | Glenn Dale | evg | |||
|
Mae
(May) | Satsuki | evg | |||
|
Magenta Rose Flame | Sommerville | dec | Fuscia | ||
| Magenta Star | Schroeder | evg | ||||
|
‘Maggie McGee’ | Holly Springs | evg | -5 F | Late Midseason | |
|
Magic | Glenn Dale | evg | |||
|
Magic Lily | Hager | evg | Early Midseason | ||
|
‘Magic Mood’ | Delp | elp | Zone 7, at least | ||
| Magnifica | Mucronatum | evg | Zones 7-9 | |||
| ‘Magnificat’ | Shapiro | elp | Zone 7, at least | Late Midseason | ||
|
‘Mai Hime’
(Dancing Princess) | Satsuki | evg | |||
|
Mai-Ogi | R. kiusianum | evg | White,Pink,Red | ||
| Maid Marion | Loblolly Bay | evg | ||||
|
‘Maigesho’ | Satsuki | evg | Zone 7, at least | ||
| Maisugata
(40462) | Hirado | evg | Red,Purple | |||
|
‘Majesty’ | Weston | evg | |||
| Majorette | Doppel | elp | ||||
| R. makinoi | Species | elp | -15° F | Pink,Rose,White | ||
|
R. makinoi ‘Margaret White' | Ayers | elp | -15° F | Pink-Light,Purple | Early Midseason |
|
R. makinoi, Hyatt Form | Species Selection | elp | |||
|
‘Malcolm Clark’ | Stewart | evg | Zone 7 | Early Midseason | |
|
Mallory | Sommerville | dec | |||
|
Mandarin | Glenn Dale | evg | |||
|
Mandarin Lights | Northern Lights | dec | |||
|
‘Mangetsu’ | R. kiusianum | evg | Pink,Red,White | Early Midseason | |
|
Manhattan | Glenn Dale | evg | |||
| Mania | Bowie Mill | evg | -15 F | Very Late | ||
|
‘Mansaku’ | Satsuki | evg | Zone 7 | Late Midseason | |
| ‘Maraschino’ | Hachmann | evg | Zone 6 | Midseason | ||
|
‘Mardi Gras’ | Bovee | elp | Zone 7. | Midseason | |
|
Margaret Douglas | Back Acres | evg | Zone 7 | ||
|
‘Margaret Lynn Gutierrez’ | Holly Springs | evg | -5F | White | Late |
|
Margaret Rowell | Harris | evg | Red | Early Midseason | |
| Margaret Slaughter | Back Acres | evg | ||||
|
‘Margaret Vogel’ | Stewart | evg | Zone 7, at least | Early Midseason | |
| Margaret White | Ayers | elp | -15° F | Pink-Light,Purple | Early Midseason | |
|
‘Margie Jenkins’ | Stewart | evg | Zone 7 | Early Midseason | |
|
Maria Derby | Robin Hill | evg | Hardy to -5F/Zone 7 | Late Midseason | |
|
‘Marian Lee’ | Back Acres | evg | Zone 7 | Purple,Red,White | Late Midseason |
|
Marie Forrester | Rosenthal | elp | Zone 7, at least | Maroon,Purple,Red | Late Midseason |
|
‘Marie Forte’ | Waterer | elp | -15 F | Late Midseason | |
|
‘Marie Susan Melkovitz’ | Stewart | evg | 0˚F | Pink-Dark,Purple | Midseason |
| Marie's Choice | Shammarello | evg | Zone 5 | Early Midseason | ||
| ‘Marie-Louise’
('Madame Marie Louise') | Indian | evg | White | Late | ||
|
‘Marilyn Jeanne’ | Aromi | dec | White | ||
|
‘Mariner's Sunset’ | Holly Springs | evg | -5 F | Late Midseason | |
|
Marionette | Glenn Dale | evg | Zone 7 | Pink-Dark,Salmon | Early |
|
Marjorie | Glenn Dale | evg | Zone 7 | Pink,Purple | Late Midseason |
| Mark Bittinger | Eden | evg | Zone 6 | White | ||
|
Marmora | Glenn Dale | evg | |||
|
Mars x R. yakushimanum (Cressman) | Unknown | elp | |||
|
‘Marshy Point Annapolis’
(Annapolis) | Marshy Point | evg | Zone 7 | Green,White | Midseason |
|
‘Marshy Point Autumn Glory’
(Autumn Glory, Two Timer) | Marshy Point | evg | Zone 7 | Orange,Salmon | Spring & Fall |
|
‘Marshy Point Autumn Magic’
(Autumn Magic) | Marshy Point | evg | Hardy to -5F/Zone 7 | ||
|
‘Marshy Point Berlin’
(Berlin) | Marshy Point | evg | Zone 7, at least | Pink,Purple | Midseason |
|
‘Marshy Point Bopalula’
(Bopalula) | Marshy Point | evg | Zone 7 | Early | |
|
‘Marshy Point Breathless’
(Breathless, Colossus) | Marshy Point | evg | Zone 7, at least | Pink-Light,White | Midseason |
|
‘Marshy Point Bridal Gown’
(Bridal Gown) | Marshy Point | evg | Zone 7, at least | White | Midseason |
|
‘Marshy Point Cambridge’
(Cambridge) | Marshy Point | evg | -15 F | Pink-Light,White | Midseason |
|
‘Marshy Point Daisy’
(Daisy, Anne Harris) | Marshy Point | evg | Zone 7 | Orange,Pink | Midseason |
|
‘Marshy Point Double Whammy’
(Double Whammy) | Marshy Point | evg | Zone 7 | Pink | Spring & Fall |
|
‘Marshy Point End Zone’
(End Zone) | Marshy Point | evg | Zone 7 | ||
|
‘Marshy Point Entrepreneur’
(Entrepreneur) | Marshy Point | evg | Zone 7, at least | Early Midseason | |
|
‘Marshy Point Fancy Nancy’
(Fancy Nancy) | Marshy Point | evg | Zone 7, at least | Midseason | |
|
‘Marshy Point Fancy Pants’
(Fancy Pants) | Marshy Point | evg | Zone 7 | Early Midseason | |
|
‘Marshy Point Fire Flower’
(Fire Flower) | Marshy Point | evg | Zone 7 | Midseason | |
|
‘Marshy Point Hanky Panky’
(Hanky Panky) | Marshy Point | evg | Zone 7 | ||
|
‘Marshy Point Heart Throb’
(Heart Throb) | Marshy Point | evg | Zone 7 | Green,White | Midseason |
|
‘Marshy Point Hugs’
(Hugs) | Marshy Point | evg | -5F | ||
|
‘Marshy Point Humdinger’
(Humdinger) | Marshy Point | evg | Zone 7 | Lavender,Purple | Fall |
|
‘Marshy Point Irish Eyes’
(Irish Eyes) | Marshy Point | evg | Zone 7, at least | White | Midseason |
|
‘Marshy Point Kakie’
(Kakie) | Marshy Point | evg | Zone 7 | Pink,Red,Salmon | Midseason |
|
‘Marshy Point Kisses’
(Kisses) | Marshy Point | evg | |||
|
‘Marshy Point Lady Baltimore’
(Lady Baltimore) | Marshy Point | evg | Zone 7 | Pink,White | Midseason |
|
‘Marshy Point Lavender Miss’
(Lavender Miss) | Marshy Point | evg | Zone 7, at least | Midseason | |
|
‘Marshy Point Love Lace’
(Love Lace) | Marshy Point | evg | Zone 7 | Pink | Midseason |
|
‘Marshy Point Marlyn Merlot’
(Marlyn Merlot) | Marshy Point | evg | Zone 7, at least | Early Midseason | |
|
‘Marshy Point Ocean City’
(Ocean City) | Marshy Point | evg | Pink | ||
|
‘Marshy Point Pam's Passion’
(Pam's Passion) | Marshy Point | evg | Zone 7, at least | Midseason | |
|
‘Marshy Point Pink Sparkle’
(Pink Sparkle) | Marshy Point | evg | -15 F | Green,Pink,White | Late Midseason |
|
‘Marshy Point Powder Cheeks’
(Powder Cheeks) | Marshy Point | evg | Zone 7 | Pink | Midseason |
|
‘Marshy Point Red Magic’
(Red Magic) | Marshy Point | evg | Zone 7 | Midseason | |
|
‘Marshy Point Red Ringer’
(Red Ringer) | Marshy Point | evg | Zone 7, at least | Spring & Fall | |
|
‘Marshy Point Red Tape’
(Red Tape) | Marshy Point | evg | Zone 7 | Early Midseason | |
|
‘Marshy Point Sarah's Wedding’
(Sarah's Wedding) | Marshy Point | evg | -5F | White | Midseason |
|
‘Marshy Point Show Girl’
(Show Girl) | Marshy Point | evg | Zone 7 | Pink-Light,White | Midseason |
| Cultivar | Group | Type | Hardy | Color | Bloom Time |