Do any of you put a garantee on your flowers?

The other day (i say the other day 7 days after buying) we had someone bring a few flowers back saying they had died quickly, ie the next day, my first question was "did you read the care card in the envelope with the card and flower food?" i got "what care card? we only took out the card and the flower food everything else we threw away"

now whilst i accept that this is probably what alot of people do, what do you think?

we have now included on the care card a 3 day garantee, is this fair? and we are making sure that we tell the person buying the flowers where the care card will be just to make sure.

thanks