Slightly fragrant and exceptionally cold hardy, Rhododendron 'April Rose' is prized for its early spring blooms. This semi-dwarf evergreen shrub bears elegant, widely funnel-shaped, double, purplish-red flowers, up to 2 in. wide (5 cm), at the branch tips in early to mid-spring. The foliage of elliptic, flat, deep green leaves turns reddish-bronze in fall. A very reliable performer, this Lepidote Rhododendron is tough and can withstand temperatures as low as -25ºF (-31ºC). It makes a lovely accent shrub that is pleasing to the eye.

Prized for its tolerance to sun, cold, and humidity, Rhododendron 'English Roseum' is a dense and showy evergreen shrub. From late spring to early summer, 'English Roseum' graces the garden with its profuse, large, dome-shaped clusters of 8 to 10, trumpet-shaped, lilac rose flowers with delicate orange freckles. They contrast beautifully with the foliage of large, smooth, glossy, medium green leaves. A very reliable performer, this pretty late midseason Rhododendron is quite tough and can withstand temperatures as low as -25ºF (-32ºC). This large ornamental shrub is perfect for background plantings or filling areas beneath deciduous trees where it will add elegance and brilliant color. 

Fragrant and exceptionally cold-hardy, Rhododendron 'Golden Lights' is a compact, deciduous Azalea that belongs to the Northern Lights Hybrid Series developed by the University of Minnesota Landscape Arboretum. Opening from red-orange buds in late spring to early summer, before the leaves unfurl, 'Golden Lights' bears abundant flat trusses of 10 luminous, funnel-shaped, golden or butter-yellow flowers with lovely salmon-pink to orange highlights. Each bloom in the truss is less than 2 in. (5 cm), but they are so profuse that the trusses look enormous. The foliage of narrow, olive green leaves has the added advantage of greater resistance to mildew than some other hybrid azalea cultivars.

Slightly fragrant and exceptionally cold hardy, Rhododendron 'Karens' is a very eye-catching, dense, and compact, semi-evergreen Azalea. In mid to late spring, it bears abundant clusters of 3 to 4 large, open, funnel-shaped, rich reddish-purple flowers, up to 2 in. wide (5 cm), elegantly darker freckled. The foliage of elliptic, glossy, olive green leaves takes on wine-red and coppery shades in fall and winter. A very reliable performer, this showy Azalea is tough and can withstand temperatures as low as -25ºF (-31ºC). It is said to tolerate neutral soils. 

With some of the prettiest flowers, Rhododendron 'Ken Janeck' is a broadleaf evergreen rhododendron that, in mid-spring, displays abundant clusters of about 13 to 17 soft pink trumpet-shaped flowers. Each richly colored bloom of this midseason rhododendron opens up from deep rose-pink buds to pale pink blossoms and gradually fades to white, the upper lobe being slightly spotted green. The dark green leaves are long, narrow, and slightly recurved with a thick coating beneath. Grows in a compact, dense multi-stemmed, and mounding shrub.

Prized for its multi-colored blooms and remarkable cold hardiness, Rhododendron 'Mount Saint Helens' is a stunning, medium-sized, deciduous Azalea. Opening from red buds in late spring to early summer, it bears abundant rounded trusses of 11 trumpet-shaped, rich salmon pink flowers with a bold golden-orange blotch for the most striking display. Extremely floriferous, this Girard hybrid features a handsome foliage of olive green leaves that turns golden-bronze in fall. This late midseason Azalea is quite tough and can withstand temperatures as low as -25°F (-32°C), without having its flower buds damaged.

Prized for its gorgeous flowers and extreme cold hardiness, Rhododendron 'Nova Zembla' is a vigorous small evergreen shrub that produces large rounded trusses of brilliant red flowers. Blooming in mid to late spring, each trumpet-shaped flower is delicately splashed with deep maroon blotches on its upper lobes. Flowering is so prodigious that they smother this midseason rhododendron in an exceptional floral display. The evergreen foliage of elliptic, glossy, thick, and dark green leaves does not develop any appreciable fall color. Raised and introduced by Koster & Sons, 'Nova Zembla' features stout trunks with thick stems, their bark becoming scaly and very attractive over time. This Catawba hybrid is regarded as one of the most popular red rhododendrons for severe climates. It is also tolerant of heat and sun.

Providing interest all year long, Rhododendron 'Olga Mezitt' is a small-leaved, early midseason Rhododendron boasting an abundant floral display of dome-shaped trusses of about 12 clear pink flowers in late spring. Each slightly fragrant bloom features inconspicuous golden green blotches that age to reddish-brown. The shiny green, lance-shaped aromatic leaves are disease resistant and turn lovely coppery-burgundy shades in winter. Grows in a wide and upright evergreen shrub.

Highly popular in North America and exceptionally cold hardy, Rhododendron 'PJM Elite' is a vigorous and showy evergreen shrub. In mid to late spring, it bears abundant rounded clusters of 10 to 15, trumpet-shaped, vibrant reddish-purple flowers. The foliage of elliptic, glossy, dark green leaves turns reddish-purple in fall and winter. A very reliable performer, this showy Rhododendron is tough and can withstand temperatures as low as -25ºF (-32ºC).

Vigorous, Rhododendron 'Roseum Elegans' is a large, dense, broadleaf evergreen shrub that is valued for its large rounded clusters of rosy lavender flowers. Blooming in late spring to early summer, each cluster (or truss) can hold up to 20 attractive bell-shaped flowers with delicate reddish-brown dorsal spotting. Borne at the tips of the upright branches, the blossoms gradually change to pink over time and contrast beautifully with the evergreen foliage of elliptic, glossy, olive green leaves. Raised and introduced by A. Waterer, this late midseason Rhododendron is tolerant of heat and cold.

Fragrant and exceptionally cold hardy, Rhododendron 'Rosy Lights' is a compact, deciduous Azalea that belongs to the Northern Lights Hybrid Series developed by the University of Minnesota Landscape Arboretum. Opening in late spring to early summer before the leaves unfurl, 'Rosy Lights' bears abundant dome-shaped trusses of 8 luminous, trumpet-shaped, deep rose-pink flowers with lovely orange freckles on their dorsal lobes. Extremely floriferous, this Azalea features a handsome foliage of narrow, olive green leaves that turns maroon in fall. 

Gorgeous and cold hardy, Rhododendron 'White Lights' is a charming deciduous Azalea that belongs to the Northern Lights Hybrid Series developed by the University of Minnesota Landscape Arboretum. Any Azalea included in this series has flower bud hardiness of -30°F (-34°C) to -45°F (-42°C) to withstand Minnesota winters. Opening from delicate pale pink flower buds in late spring to early summer, 'White Lights' bears abundant dome-shaped trusses of 5 luminous, trumpet-shaped, shell-pink flowers, with faint golden markings and gradually fading to white over time. Extremely floriferous and slightly fragrant, this bestseller Azalea features a handsome foliage of elliptic, flat, olive green leaves that turn deep bronze in fall. 

Prized for its compact habit, luminous spring flowers and remarkable cold hardiness, Rhododendron 'Windbeam' is a popular small-leaved deciduous Azalea hybrid. As the leaves emerge in mid-spring, abundant ball-shaped clusters of 8 funnel-shaped white flowers, up to 1 in. wide (2.5 cm), tinged with soft apricot, appear at the branch tips, adding elegance and beauty to this early midseason Azalea. After a few days, the blossoms age to white before turning light purplish-pink, with their dorsal lobes slightly spotted red. The foliage of small, rounded, aromatic, olive green leaves turns bronze-green in fall. A very reliable performer, this Azalea is tough, sun and heat tolerant and makes a lovely accent shrub that is pleasing to the eye.

Prized for its delightful fragrance and stunning floral display, Rhododendron prinophyllum (Roseshell Azalea) is a vigorous and showy deciduous Azalea. In mid to late spring, abundant funnel-shaped, rose pink flowers, 1-2 in. wide (2-5 cm), with elegantly protruding stamens, appear in large clusters of 4-12 blossoms, before or at the time of the emergence of the leaves. The foliage of elliptic, smooth, blue-green deciduous leaves turns attractive shades of purple in fall. Rich with strong cinnamon to clove fragrance, this Azalea is exceptionally cold-hardy and can withstand temperatures as low as -25ºF (-32ºC). A terrific landscape plant for northeastern gardens, this azalea has a marked tolerance to high pH.