The history of the introduction of the Rhododendron family to the western world reads somewhat like the script of an Indiana Jones movie. Devoted horticultural pioneers of the 19th century risked life and limb in the remote mountainous regions of China to seek out desirable species. The British Empire had an endless apetite for Rhododendrons which had to be satisfied! This was no simple Chinese Takeaway. Marauding tribesmen and man-hunting dogs along with pests and diseases were a very real and dangerous threat. We can be grateful that through them we now know of aproximately 900 species of Rhododendron which have been inter-bred to create more than 10,000 hybrids. There is really no excuse for not finding a Rhododendron that apeals.
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Rhododendrons do need consideration as to planting position. They prefer rich deep soil that has an acid ph. Basically this excludes heavy clay or chalky soils. Soil condition can be improved with the addition of peat or bark mulch. Avoid lime. Rhododendrons prefer a little dapled light in the afternoon but can be surprisingly tolerant of sun as long as their roots are kept cool with a nice layer of mulch or compost. The root system is fibrous which means lots of little roots all massed together and near the surface. The good thing about fibrous root systems is it means the plants are easy to move should you wish to give them a ride in your wheelbarrow - something I do far too much of! What else do you need to know? Unfortunately here in New Zealand Rhododendrons are susceptible to damage from a nasty little insect called Thrip. This eats through the top green layer of the leaf leaving it with a silver apearance, when it's done it then goes and hides beneath the leaf. Thrips can easily be controlled by spraying regularly with a systemic chemical insecticide which penetrates through the plant, poisoning the insect when it attacks the foliage. If you prefer a more gentle method of destruction then use an organic surfactant spray i.e. it doesn't penetrate the plant tissue, but you will have to make sure that you spray underneath the leaf as well as on the top. Some Rhododendrons can start flowering from winter onwards in warmer areas of N.Z. but the main flowering period is considered to be spring. In full flower they add a dramatic beauty to the garden and are particularly superb under tall deciduous trees. If you really want to see Rhododendrons at their best I highly recommend a trip to the New Plymouth Rhododendron festival in October/November of each year. You can then get an idea of the type of Rhododendron that suits you and your garden and here at Wairere we'll do our best to match your desires. All plants called Rhododendrons in New Zealand are evergreen and fully hardy to cold. Azaleas are also classified as Rhododendrons and some of these are deciduous - for further information see our separate category.
You'll get a real buzz when you see 'Bumble Bee' blooming its head off in your garden in spring. Large rounded trusses made up of 25 flowers that are vivid purple with a deep maroon blotch. Handsome dark glossy green foliage. Plant in dappled light and mulch roots annually to keep cool. Evergreen.
Colour: Purple / Red Habit: Upright Est. Hgt/Wdth in 7/10 yrs: 2m
Delightful mauve buds open into frilly pink flowers. Rhododendron’s prefer dappled shade, but can be grown in full sun if protected from afternoon sun or kept well watered. Prune after flowering to maintain shape and to promote new growth. Mulch root area annually to keep cool. Avoid Lime. Evergreen.
Pretty delicate rose coloured buds open to rose pink flowers. Rhododendron’s prefer dappled shade, but can be grown in full sun if protected from afternoon sun or kept well watered. Prune after flowering to maintain shape and to promote new growth. Mulch root area annually to keep cool. Avoid Lime. Evergreen.
A very desirable Rhododendron that has glossy green foliage and a nice dense, rounded form. The buds are a deep rose-red and open to shell pink blooms with just a hint of the red at the throat. Lovely. As with all Rhododendrons prefers a semi-shaded spot and acid soil. Evergreen.
Colour: Pink / Red Habit: Compact Est. Hgt/Wdth in 7/10 yrs: 1.5m x 1m
An American hybrid with large funnel shaped blooms that are said to resemble Cherry Custard Ice-Cream in tone. Don't think that's a flavour we have in NZ. Anyway the blooms are custard yellow blended with cherry red and appear in spring. Prefers dappled light and acid soil. Evergreen.
Colour: Yellow / Red Habit: Upright Est. Hgt/Wdth in 7/10 yrs: 1.2m x 1m
Compact, wide growing and vigorous. Flowers are white with yellow eye. Long, flat, light green leaves. Prefers dappled shade. Prune after flowering to maintain shape and to promote new growth. Mulch root area annually to keep cool. Avoid Lime. Evergreen.
Colour: White / Yellow Est. Hgt/Wdth in 7/10 yrs: 1.2m x 1.2m
Large rose pink buds open out to funnel shaped, frilly blooms of pale pink that gradually fade to almost white. The blooms start to appear in winter, nice compact growth habit. Plant in dappled light with acid soil and mulch annually to keep the roots cool. Avoid Lime. Evergreen.
Colour: Pink / White Habit: Upright Est. Hgt/Wdth in 7/10 yrs: 2m x 1.5m
Bring some sunshine yellow to the garden in winter with this lovely little Rhododendron which is free flowering and very showy. The open trumpet shaped blooms form loose trusses of yellow set nicely against the green slightly 'hairy' foliage. Prefers a sunny spot and acid soil. Evergreen.
Colour: Yellow Habit: Compact Est. Hgt/Wdth in 7/10 yrs: 1m x 1m
This compact bush has soft apple-blossom coloured flowers touched with a deeper pink. Leaves are deep forest green. Flowers in September. Plant in dappled light with acid soil and mulch annually to keep the roots cool. Avoid Lime. Evergreen.
Colour: Pink Habit: Upright Est. Hgt/Wdth in 7/10 yrs: 1m x 1m
Large trusses of bright red bell shaped blooms appear from late winter. Dark green foliage and an erect open habit. Plant in semi-shade with acid soil for best results however 'Cornubia' is known to cope with more sun that many other cultivars. Evergreen.
Colour: Red Habit: Upright Est. Hgt/Wdth in 7/10 yrs: 3m x 2m