We live in a border city. We cross the border quite a bit and we usually go camping in the U.S. I'll only speak in regards to vegetables. I make it a habit to call U.S. Customs and then get transferred to an agricultural agent. I always ask what is legal to bring across. Our answer has been, "if the package states on it, product of the U.S. or Canada then it's ok to bring across. The package has to be unopened". We've had open packages confiscated. Coming back to Canada, I can't ever remember being asked questions regarding vegetables or fruit. That's our experience so far.