I did this in my grow-out run. We had built a sandbox for my kids when they were younger (as opposed to buying one). They weren't using it, so we moved it (open bottom, 2x6's used to make 8 by 8 box. I put 2x4 strips (2 of them) in and then tacked hardware cloth on top. I bought rye seed and planted it, the birds love it. It is the first place the birds run to when I open the hatch in the morning. I am thinking about putting them around the entire parameter next, it has worked so well. Nice little idea I got from this website earlier and was able to use recycled material to boot. I water it when I fill the duck pools and it has done well so far in the heat.