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Rhododendron 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. CLICK HERE FOR MORE INFORMATION 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.
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