Rhododendron x ‘Old Gold’ (Exbury Hybrid) – This deciduous azalea produces iridescent golden-yellow blooms (with a slightly darker orange throat) that emerge from red buds in May and June to form a rounded truss. The mid green leaves flush with a hint of bronzing on the edges, with orange to red autumn tones. A Lionel de Rothschild hybrid. Grows 5-8′ high by 4-7′. Zone 5.
Rhododendron x ‘Fragrant Star’ (Beadle Hybrid) – This cross of Rhododendron atlanticum (native to the eastern United States) and R. canescens bears highly fragrant honeysuckle-scented pure white blooms (emerging from pink-tinted buds) that attract hummingbirds. It features bluish green foliage that shifts to red and orange in the fall. Grows 4-5′ high by 4′ wide. Zone 5.
Rhododendron x ‘Strawberry Ice’ (Knapp Hill Hybrid) – A rather famous 1947 introduction that remains popular to this day with its May to June blooming pale pink flowers (emerging from deep rose buds) with darker edges and a soft yellow blotch. This RHS Award of Garden Merit winner has green foliage and good autumn tones when planted in full sun. Grows 6-8′ high. Hardy to zone 5.
Rhododendron schlippenbachii (Species Rhododendron) – The Royal Azalea is a deciduous rhododendron native to Korea, Japan and China. It bears highly fragrant funnel-shaped pink-tinged white flowers (with light red spotting) from April to May, just as the foliage is emerging. Autumn tones include yellow, orange and red. Prefers partial shade. Grows 5-7′ high by 6′ wide. Zone 5.
Rhododendron x ‘Lemonara’ (Mollis Hybrid) – An attractive deciduous azalea with rich apricot blooms that emerge from flaming reddish-orange buds, usually in mid spring. The green lance-shaped foliage shifts to a bright red in autumn when grown in a full sun exposure. Prefers part to full sun with evenly moist acidic soils. Grows 7-8′ high by 6-7′ wide. Hardy to zone 5.