Well that's the artichokes out then, but back to my other question
"is there anything else that i could plant in the fields that the pigs would like, that will grow back naturally, after they've had their merry way with the mature plants/veg, and have been moved on. It would be nice if there was something I could plant without having to re-seed every year".
Clover is a nice idea, but I was looking for something a little more substantial that they can root out....like some sort of wild veg 'that you can buy seeds for', and will grow back even stronger after being rooted at.