AS Spring approaches and we await the glorious flowering of rhododendrons around Scotland, we should pause to reflect on the fact that they are really a dangerous alien invasive species, not native to our shores. Rhododendrons were first brought here in 1763 from Spain, to add a dash of colour to our gardens. They quickly spread, developing thick canopies that block the light from other species. They also carry diseases that are fatal to some native British trees.
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