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According to my FIL the grass keeps the hot sun off the tomatoes during the worst of our really hot summer, cooling and protecting them. I plant my tomatoes deep so the tomato root system is deeper the the grass root system, should be no competition there. If it really does work I will probably modify it next year and grow a useful grass like plant say millet, or sourgum, or quinoa.
Winter rye is a good cover crop as is buckwheat. The chickens like both.
Yes those are good for cool weather, I was talking about co-planting during the growing time. I am definately going to plant an off season cover crop both for the girls to eat and to help keep the weeds and grass at bay.