Originally Posted by Billy-Klubb
I would definitely ask the store about the flowers. where they got them & get a hold of them with your concern.
I'm not a florist or in the industry, but I did read an interesting book a few months back called "Flower Confidential" by Amy Stewart. The book is about commercial flower growers (most are in Ecuador) and the large flower auctions in Amsterdam. My bet is that the store has no idea where these particular roses came from since they went through auction.
If what she says is true, commercial roses are bathed in pesticide while growing and then cut and dipped in fungicide right before shipping to the US. Apparently the flower inspectors at customs won't let them in the country if they show any signs of fungus.
I would wait for further confirmation, but based on that knowledge, a couple of roses could potentially add both pesticide and fungicide to your final product.