Hydromulch (or hydraulic mulch seeding, hydro-mulching, hydraseeding) is a planting process that uses a slurry of seed, mulch, and fertilizer. It is often used as an erosion control technique on construction sites, as an alternative to the traditional process of broadcasting or sowing dry seed. Hydromulching allows the custom tayloring of the proper seed for your job. It is not uncommon to use two or even three seeds custom spraying the right seed for different areas on the lawn or job. A special blend of seeds will be used that will be chosen for the conditions and requirements you have.