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Hardiness – this is how well plants can deal with the cold. The Royal Horticultural Society (RHS) has 10 levels of hardiness, ranging from H1a to H7. If you click here, https://www.rhs.org.uk/plants/trials-awards/award-of-garden-merit/rhs-hardiness-rating you can read all the detail on the RHS website. H1a is a bit of a wimp in the cold, but H7 is a bruiser and can survive temperatures of more than -20 degrees.
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