For goodness sakes, don’t ever bag your lawn clippings or leaves. Mow them into the lawn and don’t put chemical fertilizers on your lawn.
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I’ve read that you don’t want too much grass. I tend to keep it half leaf matter (or more) than grass because I think I read before that it throws the nitrogen balance off too much. Maybe someone here could weigh in
I was referring more to composting than to mulching though