| Cultivar | Group | Type | Hardy | Color | Bloom Time | |
|---|---|---|---|---|---|---|
| R Lytle Lady | Unknown | elp | ||||
| R. calendulaceum, from Pottertown-Gap | Species | dec | -25 F | |||
| R. canescens dark pink | Species Selection | evg | ||||
| R. catawbiense from Alabama | Species | elp | ||||
| R. dauricum white
(Album) | Species Selection | lep | -25° F | White | Very Early | |
| R. decorum 'Sweetman's Hardy' | TBD | elp | ||||
| R. flammeum X calendulaceum | Hybrid | dec | ||||
| R. kinsai x hanaguruma | Rokujo | evg | Zone 7, at least | Midseason | ||
| R. makinoi Wing Fong selection | Species Selection | elp | ||||
|
R. maximum Red Stem | Species Selection | elp | Purple,White | Late Midseason | |
| R. maximum Leacheii | Leach | elp | ||||
| R. micranthum | Species | elp | -5° F | White | Late Midseason | |
|
R. oldhamii | Species | evg | Hardy to 0 F | Orange,Red | Early |
|
R. oldhamii 'Fourth of July' | Species Selection | evg | |||
|
R. periclymenoides, Amherst-Co
(Pinxterbloom Azalea, R. nudiflorum) | Species | dec | Z 4b-9a | ||
| R. periclymenoides, Oconee County | Species | dec | -15F. Zones 4b-9a | |||
|
R. prinophyllum
(Roseshell Azalea, R roseum) | Species | dec | -25 F | Midseason | |
| R. ripense
(R. ripense Makino, Kishi Tsutsuji in Japan) aka:[River Bank Azalea] | Species | evg | Zone 7 | Early Midseason | ||
|
R. sataense | Species | evg | |||
|
R. schlippenbachii
(Royal Azalea) | Species | dec | |||
| R. smirnowii McC2 | Species | elp | ||||
| R. tashiroi
aka:[Japan Cherry Azalea] | Species | evg | Zone 7 | Pink | Midseason | |
| R. tashiroi | Species | evg | Zone 7 | Midseason | ||
|
R. vaseyi
(Pinkshell Azalea) | Species | dec | -20 F | Pink | Early Midseason |
|
R. vaseyi, good pink | Species Selection | dec | Zone 5a-9a | Early | |
| R. vaseyi, MP425 DH | Species | dec | -20 F | Early Midseason | ||
| R. vaseyi, TNR KG LJ | Species Selection | dec | -20 F | |||
| R. vaseyi, Cashiers, NC | Species | dec | ||||
| R. vaseyi, dark pink | Species | evg | ||||
|
R. vernicosum 18139 | Species Selection | elp | -15° F | Apricot,Yellow | Midseason |
|
R. viscosum
(Swamp Azalea, Swamp Honeysuckle) | Species | dec | -20 F | Very Late | |
| R. viscosum oblongifolium | Species | dec | ||||
| R. vittata fortunei | Species | evg | ||||
|
R. yedoense var. poukhanense | Species | evg | Pink | ||
|
Rabatz | Hachmann | elp | |||
|
Radiance | Glenn Dale | evg | |||
| ‘Radiant Pink Lady’ | Reiley | elp | ||||
|
‘Radiant Red’ | Aromi | dec | Early Midseason | ||
|
Raggedy Ann | Gable | evg | Zone 7, at least | Early Midseason | |
|
Rain Fire
(#177) | Harris | evg | -5 F | Red,Orange | Midseason |
|
Ranger | Glenn Dale | evg | Zone 7, at least | Early Midseason | |
|
‘Raspberry Rapture’ | Holly Springs | evg | -5 F | Midseason | |
|
Razzberry | Sommerville | dec | Pink-Dark | ||
|
‘Rebecca Lynn’ | Holly Springs | evg | -5 F | Midseason | |
|
‘Rebecca Taffet’ | Klimavicz | evg | 0°F, Zone 7 | Green,Yellow,White | Midseason |
| ‘Reckless’ | Ring | elp | ||||
|
Red Bird | Glenn Dale | evg | Zone 7 | Red | Early |
|
‘Red Cloud’ | R. kaempferi | evg | Zone 7, at least | Early | |
| Red Companion | Pride | elp | Red | |||
| Red Demon | TBD | dec | ||||
|
Red Evening Sunset | Sommerville | dec | Red | ||
|
‘Red Feather’ | Greenwood | evg | 5°F | Early Midseason | |
|
‘Red Gem’ | Pride | evg | Red | ||
|
Red Hussar | Glenn Dale | evg | |||
| ‘Red Lustre’ | Coolidge | evg | Zone 7 | |||
| ‘Red Max’ OP | Species | elp | ||||
|
‘Red Max’ (from seed) | Species | elp | |||
|
Red Pal
(Furman 95A) | Furman | evg | |||
|
‘Red Pepper’ | Aromi | dec | Zones 6-9 | Early Midseason | |
| Red Poppy | Belgian Indian | evg | Zone 7 | |||
|
‘Red Raspberry’ | Aromi | evg | Red | ||
|
Red Red | Shammarello | evg | Hardy to -15/Zone 5 | Midseason | |
|
Red River | Leach | elp | -20° F | Pink,Red,White | Late |
|
Red Robe | Glenn Dale | evg | |||
|
‘Red Ruffles’
(Redwings, Red Wing, Red Bird) | Brooks | evg | +5°F | Early Midseason | |
| Red Slippers | Back Acres | evg | ||||
| ‘Red Spider’ | Satsuki | evg | ||||
|
‘Red Sunset’ | Arneson | dec | Zone 5-8 | Midseason | |
|
‘Red-eyed Orchid Queen’ | Schroeder | evg | Zone 6. | Purple,Red | Early Midseason |
|
‘Refrain’ | Glenn Dale | evg | Zone 7, at least | Early | |
|
Refulgence | Glenn Dale | evg | |||
|
Regina | Glenn Dale | evg | |||
|
Reid 98 | Reid | elp | Zone 7, at least | Midseason | |
|
Reid Red | Linwood | evg | +5 F | Red | |
|
‘Reijin’ | Satsuki | evg | Zone 7, at least | ||
|
‘Reiko’ #1 | Satsuki | evg | Zone 7, at least | Late Midseason | |
| ‘Reiko’ (Akamuji) | Satsuki | evg | Zone 7, at least | Late Midseason | ||
|
‘Reileyridge Bright Day’ | Reiley | elp | -20° F | Pink-Dark,Purple | Midseason |
|
‘Reileyridge Double Delight’ | Reiley | elp | -15° F | Pink,Yellow | Midseason |
|
‘Reileyridge Low Boy’ | Fetterhoff | elp | -15° F | Cream,Purple,Red | Late Midseason |
|
Reileyridge Picotee | Reiley | elp | -15° F | Red | Midseason |
|
Reileyridge Sweet Sue | Reiley | elp | -15° F | Purple | Early |
|
‘Reileyridge Target’ | Reiley | elp | -15° F | Pink,Purple | Early |
|
‘Reiley's White Cloud’ | Reiley | elp | -20° F | White | Early Midseason |
|
Remembrance | Glenn Dale | evg | |||
|
Renee Michelle | Girard | evg | Hardy to -10 F. | Pink-Dark | |
|
Requiem | Glenn Dale | evg | |||
| R. reticulatum OP | Species | evg | ||||
| ‘Reverse Windmill’ | Pilkington | elp | ||||
|
Revery | Glenn Dale | evg | Pink-Light,Purple | Early Midseason | |
|
Reward | Glenn Dale | evg | |||
|
Rhapsody | Glenn Dale | evg | |||
|
Rhea Pender | Pender | evg | Zone 5 | Pink,Purple | Early |
|
‘Rhein's Blue Ridge’ | Rhein | elp | Zone 7, at least | Midseason | |
| Rhein’s Intrigue | Rhein | elp | Pink,Yellow | |||
| Rhein’s Legacy | Rhein | elp | -25°F | Red,Yellow | Midseason | |
|
Rhein’s Luna | Rhein | lep | -25° F | Purple | Early Midseason |
|
‘Rhein’s Picotee’ | Rhein | elp | -20° F | Purple,Yellow,White | Midseason |
| Rhein’s Surprise | Rhein | elp | Red,Yellow | |||
| Rhododendron | Unknown | elp | ||||
| Cultivar | Group | Type | Hardy | Color | Bloom Time |