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But what of the Rhododendron? This shrub, which can interfere with ‘native’ woodland, still appears to be a popular garden plant, despite the fact that it can escape our gardens and infest natural woodland.
"Rhododendrons are native here"Only if you live in the Himalayas or thereabouts.The ones in the woods escaped from the gardens.
Pacific rhododendron is found along the Pacific Coast from British Columbia to Monterey County in California. It is widely distributed in the Coast and Cascade Mountain Ranges. Pacific rhododendron is less abundant in the Coastal Mountains of Washington and northern Oregon and more common south of the Siuslaw River
There are over 800 species in the genus Rhododendron, some say 1000! Azaleas are are included in the genus Rhododendron. Rhododendrons are native to many parts of the world, both tropical and temperate. The more hardy types are found in China, Japan, and eastern and western North America. [...] Because many Rhododendron species form spectacular flowers and hybridize easily, many persons, often gardener-hobbists, have and are trying to "improve" rhododendrons.