This is definitely a plant you would expect to find growing out of a crack in a rock or on top of a stone wall. I also seem to see it thrive if the rocks are acidic. Here in Cheshire it wasn't much mentioned as a plant of the Sandstone ridge which provides this County with hills in its centre, but it has spread fast in the last decade taking to the acid porous sandstone like a weed in ploughed field. In the sixteenth century U. rupestris took a liking to many stone buildings and even grew on London's Westminster Abbey.
Les Domains, Guernsey 20th June 2004
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Added on November 26th 2004