I have a large commercial site I maintain. Twice a year, we remulch the whole place (8 parks of varying sizes). Every time we mulch, we use between 1800-2400 bags of mulch. Don't ask why we use bags. We do it because it's faster, easier, cleans up easier, and we don't want Bobcat tracks everywhere tearing our parks up. Anyway, I have a "know-it-all" Board Director who thinks of himself as a landscaper (has a truck with a small zero turn and a few weedeaters.) He saw us remulching yesterday and asks why I'm already remulching, since we just did it 6 months ago. I explained that we do it twice a year, and that's been that way for the last 9 years. His position was that twice a year is excessive. Once is enough. I know it's not, and I could give him all the benefits of having a 3" layer of mulch (moisture retention/weed suppression/etc) My distributor printed on their bags "Apply an initial layer of 3-4 inches, and replace 1-2 inches every season". That tells me that the supplier recommends 4 mulchings per year. I do twice a year to save my clients money. What say you, fellow Lawnsiters?