Hydromulch is a groundcover mixture used for erosion control and vegetation establishment. It’s made from a slurry of water, seed, fertilizer, tackifier, and other materials like mulch and soil additives, sprayed onto soil surfaces.

Yes, with the right equipment, such as a hydroseeding machine or spray applicator, and an understanding of the mixture's composition, including appropriate fertilizer and organic matter ratios, you can hydroseed yourself. It's a task that requires skill and knowledge of botany and sowing techniques.

Hydroseeding over existing grass is possible but not always recommended. It’s important to ensure that the new seed has contact with the soil to germinate effectively. This might involve dethatching or aerating your lawn to remove any barriers.

A hydromulch tackifier is an additive, often a biodegradable polymer like guar or starch, used to glue the hydromulch components together and to the ground, improving adhesion and reducing the risk of being washed away by rain.

Hydroseed can grow on hard ground if it’s properly prepared. Breaking up the soil surface and incorporating organic matter or topsoil can help create a more suitable seedbed for the hydroseed to take root.

The disadvantages can include the initial cost of the materials and equipment, the need for careful timing to avoid rain washout, and the potential for uneven growth if not applied uniformly under high-pressure spray.

Hydroseeding without topsoil can be challenging as seeds generally need a nutrient-rich medium to thrive. However, innovative hydromulch mixes can include soil amendments that may compensate for a lack of topsoil.

Hydroseed refers to the process of spraying a seed mixture onto a soil surface, while hydromulch generally includes the seed within a mulch matrix, providing additional erosion control and moisture retention.

Properly applied hydroseed, especially with a tackifier, is designed to resist being washed away by light to moderate rain. However, heavy rainfall soon after application can cause erosion and seed displacement.

The best time to hydroseed is typically in the seasons of spring and fall when the weather conditions provide adequate moisture and moderate temperatures, which are conducive to seed germination and growth.