Every part of this small bulb is poisonous, and eating it can be fatal. It carries heart-affecting compounds (cardiac glycosides), and the signs are mouth pain, nausea, vomiting, cramps, diarrhoea and a slowed heartbeat. Plant it where small children do not graze, and treat any real ingestion as an emergency. The sap can also irritate sensitive skin, though only briefly.
For gardeners who like to stay ahead.