Large

Scented white flowers in late April - May, An excellent vigorous easily grown variety. Worth trying on neutral soils.

Large plant, improved by pruning. Much like auriculatum, flowers medium pink, deeper in throat, trumpet shaped. Heat tolerant., June

Evergreen tall shrub with enormous scented flowers, blush pink-white with pale green spots within, held in magnificent upright trusses. Tall tree-like open habit, requires a sheltered and shaded site., late May

Upright shrub. Dark green leaves. Lavender mauve flowers with deep brownish red marking outside,. Good for cold gardens. Sun tolerant and heat resistant., late May-June

Evergreen shrub with trusses of lilac flowers mid-season, whitish-lilac inside with yellow/brownish markings, May

Light purple tinged blue, centre, white., April-May

Named for Boddaert, foreman to van Houte of Ghent. Compact, round trusses of 18-22. Buds lavender pink open to funnel shape flowers. White with a crimson ray and dark purple markings, April

Extremely hardy, handsome dark green leaves. Funnel shaped lilac flowers in full, rounded trusses., May-June

A medium sized, compact rounded shrub with glossy mid green leaves. Bears pink flowers with a prominent red blotch. Requires neutral to acid soil., March-April

Tolerant of the sun and cold, this compact growing hybrid grows beatifully even when planted in location often considered too exposed for a Rh. A broad and dense shrub. Flower White. J.Waterer before 1886, May

Compact evergreen shrub with pale pink flowers; , valuable for its early flowering, used to be forced for Christmas in Fance until early 1900 but name is deceptive - with us, flowers in March., January-March

Frilly edges, 3" wide, inside pale Yellowish-pink with a pale yellow blotch and red spots, outside deep purplish-pink at margins, shading to pale purplish pink at base., May

A medium sized dense shrub with dark green glossy foliage. In May bears light pink flowers with a deep red flare. Requires neutral or acid soil. _x005f_x000d_, Late May

Huge trusses of Pale pink with deeper pink margins,a few spots on upper lope, June

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A medium to tall shrub. In late May bears lilac-pink flowers marked with red and pink._x000d_Requires neutral or acid soil. _x000d_,

Forms a very dense shrub, olive green leaves. White flowers, with a yellow eye in upright trusses. Can survive cold exposed gardens,useful shelter plant or hedge. James Cunningham of Comely Bank 1830, May-June

Upright shrub, well covered in dark green leaves. Well formed trusses of dark red flowers,, April-May

Carmine buds open to large,filly soft pink marked crimson shading to white May-June. Good foliage, May-June

Tall bushy variety, dark green curved leaves, double deep lilac flowers, Very hardy and vigorous. Flowers last longer in light shade. Recommended alternative to R. ponticum - better colour, as tough, and not an invasive weed!, May-June

Scarlet, June

Tree like habit, bushy when young. Well covered in polished dark green leaves. Deep yellow flowers flushed at the margins with pale rose, May-June.Highly recommended., May-June

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Fine bushy plant ,mid green leaves. Loose trusses of rose pink flowers with a crimson blotch.very much like Mrs Furnivall, May-June

Fine old tree like variety . Slightly curved pale green leaves.Flowers deep strawberry red fading to pink,March-April. Best in a sheltered site., March-April

Good tough hybrid, introduced in before 1900. Forms dense bushy shrub becoming more open at maturity. Blush pink flowers. Good variety for cold exposed gardens., May-June

Compact shrub . A medium sized vigorous shrub with dark green slightly twisted foliage. Bears large trusses of waxy red flowers with darker spots. Requires neutral or acid soil., April-May

Fine old hybrid, first introduced in 1835, forms a very compact flat topped shrub. Olive Green leaves. Pink Flowers, cream inside, deep pink line down each petal, March-April. Very hardy and well worth growing, particularly in cold gardens., March-April

Light bluish-lavender, slightly frilled flowers with a faint blotch in a small rounded truss. Glossy foliage in tiers on a vigorous, bushy, compact but open plant., May-June

Bushy shrub with dark green foliage and rich red flowers., May-June

Stiff upright habying compact in a sunny position, dark green leaves, deep red flowers with a black blotch in neat trusses. Good in cold gardens., May-June

Needs woodland shelter. Vigorous. Bright scarlet red flowers, absolutely huge and set on top of a swirl of a deep green, thick, waxy leaves., May

Gorgous black buds open to dark burgundy red flowers with a darker blotch, wavy edge and striking cream coloured anther,

Tall upright habit. Very dark leaves. Mid pink flowers with a yellow eye .Very hardy, useful late flowering variety, especially good for cold gardens., June-July

Compact upright plant with convex dark green leaves. Large dark purple flowers in upright trusses, with a golden flare in the throat. Stunning with creams and yellows., late May-June

Rich pink buds opening delicate pink, fading to white with very faint brownish on upper lodes; pink stamens, and a few pink streaks (J.Waterer 1925), May-June

A taller more open form with stunning pink trumpets A.M. (RHS) 1925, May

Superb bushy hybrid. dark green leaves. large trusses of apricot pink flowers Highly recommended especially for cold gardens. (M.Koster & Son 1909), May-June

Flowers open blush pink , fading to white tinged mauve, inside fading white with reddish brown blotch, ( A.Waterer before 1901), May-June

Superb new introduction, forming a dense compact shrub. Bright green leaves. Huge rounded trusses of rose pink flowers, speckled brown, AM1987, April-May

Light violet with conspicuous deep burgundy red, almost black blotch, Bred by H.Hachmann, May

Still one of the most popular larger hybrids. Open growing with large pale green leaves.Large, soft rose pink flowers in tall conical trusses, May-June. Good for cold gardens. J.Waterer 1897, May-June

Magnificent hybrid, forming a small tree. Long dark green leaves, sweetly scented white flowers with a green throat. Highly recommended. Can scent the whole garden in high summer. Other clones may flower later., June-July

Compact upright variety. Dark matt green leaves covered below with a yellowy fawn indumentum. Glowing dark crimson flowers in domed shaped trusses, April-May. About the darkest colour of any medium height rhododendron. Very hardy but always leggy., April-May

Orange flowers with deep orange markings., May

Pink flowers, fading to salmon on the tube. Lady Loder, FCC 1937 (her Son, Giles backwards),

Forms a large compact shrub. Dark green leaves with a purple leaf stalk. Amethyst violet flowers, spotted dark purple on the inside of top petals, in large dome-shaped trusses. Highly recommended, unusual coloured variety., April-May

Compact habit,slightly curved dark green leaves, large trusses of red flowers, Very hardy and good for small gardens., May-June

Flowers open pale yellow with a pink blush and crimson blotch and fade chinese yellow. Compact dark glossy foliage., May

This plant grows into a magnificent mound of green with bright fiery red flowers., May-June

Large pink buds open to a pinky white, which fades to a pure white in sun; long lasting flowers in a tall upright truss. Fine old hybrid, introduced in 1896., May

Rosy flower buds open to pure white, fragrant, stained green flower. elongated evergreen green foliage, May

Large evergreen shrubs or trees, often growing to 100 ft. in the wild, (hence its name, meaning "tree-like") but rarely over 40 ft. in cultivation. Leaves dark green with white to silver-colored indumentum below. Flowers white / pink / red., March-April

Elegant upright habit,dark green leaves; striking lavender- blue azalea-like flowers. Best in a little shade. Superb blue mist-like effect in the woodland, like bluebells but not quite so pure blue., April-May

Handsome tree like species with matt green leaves up to 15cm long. Scented white flowers often 7.5 x 8.5cm, An excellent vigorous easily grown variety. Worth trying on neutral soils., late April-May

Spreading habit, bristly twigs, attractive reddish brown peeling bark. Dark green hairy leaves. Creamy yellow flowers. Needs shelter from cold winds., May

Leaves are long and narrow flat, not wavy, small flowers pink, May-June

Upright species. maroon shoots with bright green leaves. Masses of bright pink flowers, some from leaf axils., March-May

Attractive free flowering shrub, dark green leaves, bluish green below. Rose purple flowers., April

Flowers in clusters of 3, widely funnel-shaped, 5-lobed,spectrum violet, outside light cyclamen purple. Upright shrub to 2m., with small, hairy foliage., June-July