Hydroseed mulch protects seed over winter by holding moisture at the soil surface, softening temperature swings, and binding seed and soil together so frost heave and runoff don't strip them away. That hydromulch winter protection is a big reason late-season and dormant hydroseeding tends to hold up better than dry seed scattered on bare ground. It isn't a heated blanket, and it won't save seed on a steep slope during a February downpour on frozen soil. But in a typical North