| Rating | Plant | Thumbnail |
| Rhododendron 'Babylon'
Rhododendron | |
| Rhododendron 'Baden Baden'
Rhododendron |  |
 | Rhododendron 'Balalaika'
Rhododendron
Hybridized by Hachmann, 1987 |  |
| Rhododendron 'Balsaminiflora'
Rhododendron indicum |  |
| | Rhododendron 'Bambi'
Rhododendron
Hybridized by Wiseman, 1951; registered 1986 |  |
| Rhododendron 'Bambino'
Rhododendron |  |
| Rhododendron 'Barmstedt'
Rhododendron | |
| Rhododendron 'Bear Claw'
Rhododendron | |
| | Vireya Hybrid 'Belisar'
Rhododendron | |
| Catawba Rosebay, Catawba Rhododendron, Mountain Rosebay 'Belle Heller'
Rhododendron catawbiense |  |
| Dexter Rhododendron 'Bellringer'
Rhododendron | |
| Azalea 'Belva's Joy'
Rhododendron | |
| Azalea 'Ben Morrison'
Rhododendron |  |
| Rhododendron 'Ben Moseley'
Rhododendron | |
| Azalea, Rhododendron 'Bengal'
Rhododendron |  |
| Maddenia Rhododendron 'Bernice'
Rhododendron | |
| Azalea 'Berryrose'
Rhododendron
Additional info: (Knap Hill hybrid) |  |
| | Rhododendron 'Besse Howells'
Rhododendron
Hybridized by Shammarello, 1964 |  |
| Azalea 'Betty Anne Voss'
Rhododendron
Hybridized by Robert Gartrell
Additional info: ('Robin Hill' Series) | |
| Pink Swamp Azalea, Swamp Honeysuckle, Clammy Azalea 'Betty Cummins'
Rhododendron viscosum | |
| Robin Hill Azalea 'Betty Layman'
Rhododendron
Hybridized by Robert Derby Gartrell
Additional info: ('Oakland' x 'Heiwa') | |
| Azalea 'Bibiani'
Rhododendron | |
| Azalea 'Big Deal'
Rhododendron
Hybridized by Mezitt | |
| Rhododendron 'Bikini Island'
Rhododendron | |
| Rhododendron 'Biloxi Blues'
Rhododendron
Additional info: (aka Biloxi) | |
| | Rhododendron 'Bixby'
Rhododendron
Hybridized by Mezitt |  |
| | Kurume Azalea 'Blaauw's Pink'
Rhododendron
Hybridized by Kurume |  |
| Azalea 'Black Sport'
Rhododendron | |
| Azalea 'Blaney's Blue'
Rhododendron | |
| Azalea 'Blewbury'
Rhododendron | |
| Azalea 'Bloom-A-Thon Pink Double'
Rhododendron
Additional info: (PPAF) | |
| Azalea 'Bloom-A-Thon Red'
Rhododendron
Additional info: (PPAF) | |
| Azalea 'Bloom-A-Thon White'
Rhododendron
Additional info: (PPAF) | |
| | Small-leaf Rhododendron 'Blue Baron'
Rhododendron
Hybridized by Weston Nurseries, 1981 |  |
| Rhododendron 'Blue Boy'
Rhododendron |  |
| Azalea 'Blue Danube'
Rhododendron |  |
| Rhododendron 'Blue Jay'
Rhododendron |  |
| Azalea 'Blue Lagoon'
Rhododendron | |
| Rhododendron 'Blue Pacific'
Rhododendron |  |
| Rhododendron 'Blue Peter'
Rhododendron
Hybridized by Waterer & Crisp, mid-1930s |  |
