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BMP C121 : Mulching <br /> Purpose <br /> Mulching soils provides immediate temporary protection from erosion. Mulch also enhances plant <br /> establishment by conserving moisture, holding fertilizer, seed, and topsoil in place,and moderating <br /> soil temperatures.There are a variety of mulches that can be used.This section discusses only the <br /> most common types of mulch. <br /> Conditions of Use <br /> As a temporary cover measure, mulch should be used: <br /> . For less than 30 days on disturbed areas that require cover. <br /> . At all times for seeded areas,especially during the wet season and during the hot summer <br /> months. <br /> . During the wet season on slopes steeper than 3H:1 V with more than 10 feet of vertical relief. <br /> Mulch may be applied at any time of the year and must be refreshed periodically. <br /> For seeded areas, mulch may be made up of 100 percent: <br /> . cottonseed meal; <br /> . fibers made of wood, recycled cellulose, hemp, or kenaf; <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume 11-Chapter 3-Page 289 <br />