This means covering over the plot with a layer of, damp peat, bark fibre, hop manure, farmyard manure, grass etc., in order to save evaporation. It is merely laid on, not dug in, its purpose being to prevent the sun drying up the surface soil too rapidly.
If left on it also gradually manures the soil. Mulching in spring should only be undertaken when the soil has really warmed up and all weedhave been removed. If the soil is dry water freely before putting on the mulch which should be 2—3 in. deep.