I have read that it can be a noxious weed, but not in heavy clay soils, which I have. I like the appeal of the pea shrub being a perennial, because I could use it to line the outside edge of the chicken run, and it wouldn't hurt them to eat it.
I also grow them beans and sunflowers and such, along with using clover as a living mulch in the areas of the gardens that they are allowed to free range in. I figure, every bit of food I grow for them is a bit less I have to buy, and the cost of feed has been climbing.