Mulch makers

Anything that falls to the ground but these plants in particular: artichokes, cardoon, rhubarb, comfrey, Jerusalem artichoke, ferns, reeds, and nasturtium.

Green manure cover crops for mulching in place: clovers (especially sweet clover which grows 5 ft tall), vetches, many grasses and grains, mustard, crotolaria, buckwheat.

Living mulches (soft undercover of greenery that protects soil): dwarf yarrow, thrift, Ajuga, wild strawberry, stonecrop, periwinkle, white clover.