Organic flowers are generally safe. However most flowers you receive in bouquets are likely to have been treated with pesticides so it’s not safe to feed unless you know they’ve never been chemically treated.
Stacy, Torian, HCA and BugBoy are all correct. They are poison to animals, specifically mammals even fatal. Tulpalin, the fatal toxin, primarily found in the bulb does not bother decapods. Do not use the following as a rule but a common sense approach instead of science, bees would avoid and not pollinate them if they were poison to our hermies.