Here are some cottongrass seed heads. This is slender cottongrass. Tall cottongrass is perhaps the largest species, and has gotten a lot of human attention. The plant, particularly the young stems and leaves is edible. The base and roots are more sour, and were more used as medicine. The cotton has been used as stuffing or as swabs. Tall cottongrass is the floral emblem of Machester County, England. Is that a boggy place?