In article , Alan Gould
writes
Your clue re. 'hugging boulders' led to the 'alpina' bit.

Ooooh, it's a bit bigger than alpina!!
After about 3 years it has spread about 12 feet and 'dropped' over the
rocks about 4 feet and it's still going strong!!
I wonder if it was mislabelled?
--
Jane Ransom in Lancaster.
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