Also, I have a large list of edible flowers if any one is interested. I can email it to you.

The sap (leaves, stems) may cause dermatitis, the roots have a chemical that is toxic (emetic: nausea, vomiting).

In my brief search, I found nothing regarding the flowers or petals. Could be that just a few for color are harmless but you won't know until you try it. You might rub some petals on the inside of your wrist or elbow to see if you have a reaction (dermatitis) before eating them.