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British and Irish gardens use the RHS H1 to H7 hardiness scale. American gardens use USDA zones 1 to 13. Here's a clear conversion table, plus the climate quirks that make a direct translation fail more often than it works.


Grapes are being grown commercially in Ireland — really. What does the rise of Irish viticulture tell us about the way the climate has shifted, and what does it mean for what you can grow in your own back garden?

English sparkling wine now beats champagne in blind tastings. Vineyards have spread from Sussex to the Midlands. What does the rise of British viticulture say about how the climate has shifted — and what does it mean for your own garden?
