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Paterson's curse
noun a biennial herb, Echium plantagineum, native to the Mediterranean area, but widely naturalised in settled parts of Australia, having blue-purple flowers. Compare Lachlan lilac, Murrumbidgee sweet pea, Riverina bluebell, Salvation Jane.
Contributor's comments: As a child living in the Riverina we called this scourge Paddy's Curse.
Contributor's comments: Aka 'Patto' (pronounced 'paddo').
Contributor's comments: In Wagga area known as Patterson's Curse. Never heard any of the other usages.