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Hummingbirds zipped in and out of a purple buddleia bush; Hugo, an eager-to-please Border collie, stretched out on the porch, smelling faintly of skunk.

Edinburgh’s old Royal Infirmary has been abandoned for more than a decade, its doors boarded up, its gutters overgrown with buddleia and fireweed.

Adults tend to feed on flowering plants and are often attracted to buddleia plants.

Rather than roses and other highly bred ornamentals, monarch butterflies depend on flowers like daisies, asters and buddleia, a flowering plant commonly called butterfly bush.

The planting includes birch trees, buddleia bushes, grasses and ferns.