Gardens: what to do this week

Discover the story of the British elm, check your gutters and plant a medlar

Could you spot an English elm at 40 paces? Me neither. But here's a chance to learn about this iconic tree: an installation at Somerset House in London marks National Tree Week. The free exhibition tells the story of the elm, from its role as the raw material that helped bring piped water to the capital, to its sad decline in the 1970s in the wake of Dutch elm disease.

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