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Why spent ash from dug up shale rock is home to many rare grasses and flowers

The giant bing at Greendykes is host to avenues of hawthorn trees. University botanist Barbra Harvie says they have grown from seeds dropped by birds as they picked up cast-off bread crusts tossed away by workers hitching a lift to the top of the bogeys that carried spent shale to the bing summit.

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