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His goal, working with the National Trust and Natural Resource Wales, is to restore some of that biodiversity by re-introducing the extinct rosy saxifrage - a plant he calls a mountain jewel - to Eryri or Snowdonia.

Springy moss, purple and yellow saxifrage, and a type of buttercup stay within centimetres of the ground.

The grots and rocky walls were already starred with saxifrages and stonecrops.

And in confirmation, a little Arctic flower, a purple saxifrage, blossomed improbably where the witch had planted it as a signal in a cranny of the rock.

Glints of colour, purple saxifrage, sphagnum moss, the reddening leaves of the bilberry.