Sheet-mulch materials containing nitrogen

Below the sheet-mulch barrier (cardboard, newspaper, heavy paper bags):
Aged but seedy manure, fresh manure, legume hay (e.g. alfalfa), vegetable kitchen waste, weeds


Above the sheet-mulch barrier (cardboard, newspaper, heavy paper bags):
Aquatic weeds & algae, coffee grounds, aged seed-free manure, grass clippings, seaweed