Early flowering (up to the end of April)
Rhododendron barbatum: spreading shrub or small tree with glossy, dark-green leaves. Tubular to bell-shaped, deep crimson to scarlet-red flowers in dense, rounded heads. Height 8m (26ft).
R. calophytum AGM: large, spreading evergreen shrub with long, narrow elegant leaves and large trusses of white or pale pink, bell-shaped flowers, spotted within with maroon. Height and spread 8m (26ft).
R. 'Christmas Cheer' (caucasicum hybrid): medium-sized, evergreen shrub, flowering in late winter and early spring with rounded trusses of funnel-shaped, very pale pink flowers from darker pink buds. Height and spread 2.5m (8ft).
R. (Cilpinense Group) 'Cilpinense': free-flowering small evergreen shrub of rounded habit with glossy, broad leaves and funnel-shaped, pale pink flowers. Height and spread 1m (3¼ft).
R. 'Countess of Haddington': compact spreading evergreen shrub, with hairy dark green leaves and slightly fragrant, funnel-shaped white flowers flushed with pink. Height and spread 1.5m (5ft).
R. dauricum ‘Midwinter’ AGM: Very hardy, deciduous or semi-evergreen variety with a height and spread of 1.5m (5ft) and rose-purple flowers in early spring.
R. fulvum AGM: large shrub or small tree with dark green leaves with striking cinnamon indumentum beneath. Pale rose-pink, bell-shaped flowers 4cm wide, in compact trusses. Height and spread 4m (13ft).
R. grande: small tree or large shrub with large, leathery leaves. Bell-shaped, cream to pale yellow flowers, each with a purple basal blotch, open from pink buds and are held in dense, rounded trusses. Height 12m (40ft).
R. Nobleanum Album Group: evergreen with narrow green leaves with silvery undersides. Flowers for several months in the late winter until early spring. Pale pink in bud, the flower trusses open to a pure white. Height 2.5m (8ft).
R. ‘Nobleanum Venustum’: evergreen leaves with silvery undersides. Flowering in late winter to early spring; trusses of mid pink flowers, spotted dark pink in the throat. Height 2.5m (8ft).
R. 'Praecox' AGM: More-or-less evergreen shrub with dark, glossy oval leaves and funnel-shaped, rosy-purple flowers 4cm in width, in small clusters at the branch tips from late winter. Height and spread 1.5m (5ft).
R. 'Ptarmigan' AGM: compact spreading dwarf shrub with small, scaly dark green leaves. Clusters of pure white flowers 2.5cm in width from early spring. Height and spread 1m (3¼ft).
R. sutchuenense: large shrub or small tree with drooping leaves up to 30cm long. Trusses of bell-shaped flowers ranging in colour from pale pink to a rosy lilac with red or purple spots. Height 12m (40ft).
R. (Tessa Group) 'Tessa Roza': small, erect evergreen shrub with dark, glossy ovate leaves and small clusters of deep rose-pink, funnel-shaped flowers 5cm in width in late winter and early spring. Height and spread 1.5m (5ft).
Mid-season flowering (May)
Rhododendron macabeanum AGM: Evergreen tree rhododendron with huge trusses of creamy to deep yellow flowers in mid-spring and large leaves to 30cm (12in) long; eventual height of 15m (50ft) and spread of 6m (20ft).
R. 'Daviesii' AGM: Deciduous azalea with a spread of 1.5m (5ft), with bluish-green leaves and buff buds opening to fragrant white flowers with a yellow flare, at first tinged pink, in late spring and early summer.
R. 'Exquisitum' AGM: deciduous azalea with open habit; long-tubed, frilled, fragrant cream flowers suffused with pink and with an orange flare in the throat, opening in late spring and early summer. Height and spread 1.5m (5ft).
R. 'Faggetter's Favourite' AGM: large, hardy hybrid with shiny leaves. Pink buds open to funnel-shaped, fragrant white flowers 9cm in width, tinged pink and speckled green in throat, borne in elongated trusses. Height and spread 2.5m (8ft).
R. 'Fragrantissimum' AGM: medium-sized shrub with open habit, and veined, hairy, dark green leaves. Funnel-shaped, spicily fragrant white flowers with a rose-pink flush, yellow in the throat, and borne in small trusses. Height and spread 2.5m (8ft).
R. 'Irene Koster' AGM: deciduous azalea with an open habit, with fragrant, funnel-shaped deep pink and white flowers 5cm in width, with an orange flare and deep rose-pink tube. Height and spread 1.5m (5ft).
R. lindleyi: evergreen with dark green leaves. Fragrant, funnel-shaped flowers in clusters of 4-8 in creamy-white, often edged and tinged with pink and blotched orange or yellow at the base. Height and spread 1.5m (5ft).
R. 'Mrs A.T. de la Mare' AGM: large spreading shrub with glossy, dark foliage. Slightly fragrant white flowers 10cm wide, with green spots in the throat, open from light pink buds in late spring. Height and spread 2.5m (8ft).
R. (Loderi Group) 'Loderi King George' AGM: large evergreen shrub with long, pale leaves, and scented, white, lily-like flowers to 15cm wide, opening in tall trusses from bright pink buds in late spring and early summer. Height and spread 4m (13ft).
Late flowering (early June to mid-July or later)
R. arborescens AGM: large deciduous azalea with glossy green leaves that produce good autumn colour. Strongly-scented, funnel-shaped white flowers in small clusters, with deep pink, protruding stamens. Height and spread 4m (12ft).
R. 'Corneille': bushy deciduous azalea with leaves colouring well in autumn. Flowers double, fragrant, cream, flushed deep pink on tube. Height and spread 2.5m (8ft).
R. ‘Cynthia’ AGM: Grows to a height and spread of 6m (20ft) with trusses of rose-pink flowers in late spring.
R. ‘Dopey’ AGM: Evergreen variety with a height and spread of 2m (6ft) and long-lasting red flowers in late spring.
R. decorum AGM: large evergreen shrub or small tree, with oblong leaves, pale beneath, and trusses of large, strongly fragrant, funnel-shaped white or pink-tinged flowers, greenish-yellow in the throat. Height 8m (24ft).
R. luteum AGM: Deciduous type for full sun with a height and spread of 4m (12ft) and strongly scented yellow flowers in late spring.
R. 'Norma': compact deciduous shrub with light green foliage that colours well in autumn, and double, orange-flushed, deep rose-pink flowers with a slight scent. Height and spread 1.5m (5ft).
R. occidentale: bushy medium-sized deciduous azalea with glossy foliage turning orange and yellow in autumn. Fragrant, funnel-shaped flowers to 10cm in width are white or tinged with pink, and blotched yellow within. Height and spread 2.5m (8ft).
R. (Polar Bear Group) 'Polar Bear': vigorous large shrub with mid-green leaves to 30cm in length. Lily-like, fragrant pure white flowers 11cm in width, with a small light green blotch at the base of the throat, are borne in late summer. Height and spread 4m (12ft).
R. viscosum AGM: bushy deciduous azalea with dark leaves that are glaucous beneath. Very fragrant, narrowly funnel-shaped white flowers up to 4cm wide, flushed deep pink on the tube, open in early summer. Height and spread 2.5m (8ft).
R. yakushimanum ‘Koichiro Wada’ AGM: Dome-shaped rhododendron to 2m (6ft) across and high, with rose-pink buds opening to pale pink flowers in late spring.
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