Not knowing how large an area you are trying to fill it's hard to say. I was advised when I first planted hairgrass to break the bunches up into smaller bunches and plant an inch or so apart. As reference the pic below was my original planting. That was then pulled back up and the bunches you see below were split into 4 or 5 and replanted in a grid pattern about 1 inch apart. The amount you see there covered over thress times the area seen below when planted as advised.
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