Iris germanica
Elegant sword-leaved perennials with intricate, ruffled blooms.
Toxic to cats and dogs, the rhizome most of all. Vomiting, drooling and diarrhoea are the usual signs.
The rhizomes irritate skin and are the most poisonous part if eaten. Wear gloves to lift or divide a clump.
For gardeners who like to stay ahead.