I am moving my coop in a month or two to a unused piece of my backyard about the size of I'd say maybe 50x20. Right now there is grass there but I would like to plant some greens for the hens to continuously graze on, Alfalfa most likely. I was wondering if anyone had experience in this? I wasn't sure if I have to rototill all the current grass and start new with alfalfa or do I just throw it over the current grass and work it a bit into the soil? Any other tips about growing this stuff would be helpful. Thanks!!