I am wanting to plant up 16by16 enclosure Avery off my chicken runs. I am wanting it to look like natural bird exhibit. There will only be a few birds in it at a time. It is sort of a play area not their main runs. There is a large Hackberry tree already in the middle of this area, which I know my birds eat. I was wanting to know it there are any types of bushes or grasses that will grow in enrich chicken poop soil. I know of Grass/clover boxes and vegetables but not much about more landscape type plants. Ant suggestion or picture's of Avery type runs?