No Lulu I don't dislike anyone bad enough to dice a bulb into their salad I think its got to be a particular variety for it to work..if the bulbs are ingested before they have flowered then your correct they are deadly poison.but if you let them flower and then take the seeds and when they mature use them before they get a chance to flower the poison is not at all toxic below is a explanation it is also a very potent drug it seems...
---Medicinal Action and Uses---The Colchicum is valued for its medicinal properties. The parts used are the root and seeds, these being anti-rheumatic, cathartic, and emetic. Its reputation rests largely upon its value in acute gouty and rheumatic complaints. It is mostly used in connexion with some alkaline diuretic; also in pill form. Overdoses cause violent purging, etc.

The active principle is said to be an alkaline substance of a very poisonous nature called Colchinine. It is acrid, sedative, and acts upon all the secreting organs, particularly the bowels and kidneys. It is apt to cause undue depression, and in large doses acts as an irritant poison. Dr. Lindley relates the case of a woman who was poisoned by the sprouts of Colchicum, which had been thrown away in Covent Garden Market and which she mistook for onions. hence the reason garden centre's dont stock them...you know what kids are POP and its in the mouth...in fact I do it myself at the herb section I picked what i thought was corriander once it tasted terrible someone had just dumped it in with the herbs...looked like but did'nt taste like...