Warm welcome from the Pacific NW, CatHill. I am just back into the chicken business myself after about a 25 year hiatus. I've been doing some research on things to plant around the chicken yard, but have no first hand knowledge to pass on as yet. Here's my short list: they may leave alone wild roses, forsythia, daylily, daffs, mint, or lavender. Plants they would relish as snacks around the perimeter might include jeruselum artichokes, comfrey, sorrel, sunflowers, sweet cicely, and daylily. (Note the discrepency, on one hand I read daylillies would be left alone, and on the other that they would snack of them. So who knows...) I further understand that even with chicken wire, the hens will establish about a 6" perimeter outside their fenced yard where they poke their heads through.
I also toss them buckets of weeds which they like - they scratch through for bugs first and then either eat or toss around the rest. If I'm weeding an area heavy in buttercups I don't toss that to them, but I don't worry about small amounts.
It's my experience they will eat what they like and ignore what they don't. I don't get over-worried about potentially toxic plants. I've read that citrus is not good for them, but I have noticed my neighbor has not caught on to that and her chicken yard is full of those little Christmas orange peelings that her hens don't touch.
