Biochar in Hydrospraying and Hydroseeding

Hydroseeding brings seed, mulch, water, and selected amendments together in a sprayable mixture. It gives crews a practical way to seed large areas, slopes, and places that are difficult to reach. Mulch helps keep seeds moist and in place while they begin to grow. ¹

Biochar is already part of successful hydroseeding applications, including projects carried out by Wakefield customers. ² It can support early plant growth and help retain resources around young roots, making it a useful addition to a well-designed growing mixture. ³, ⁴

See Biochar Hydrospraying in Action

In this episode of OutStanding with Wakefield, we visit Bob Arello, owner of Hydrograss Technologies, in Sarasota, Florida, to see how biochar fits into the company’s industrial hydrospraying process.

The conversation highlights how the ingredients work together: biochar contributes to the growing mixture, while mulch and binding materials help hold it in place as vegetation establishes. Bob also discusses erosion control and the importance of keeping seed and soil from washing away. ⁵

How Biochar Supports Plant Establishment

Biochar has improved root and aboveground growth in controlled hydroseeding research. In greenhouse trials on gold mine tailings, a wood-based biochar helped grasses and clover grow in a challenging material. The response varied by biochar and plant species, highlighting the value of choosing a suitable material for the mixture. ³

Successful field applications also show biochar’s role in revegetation. At Colorado’s Hope Mine, a treatment containing biochar, compost, seed, hydromulch, and mycorrhizal fungi established plants within a year. Biodegradable netting held the treatment in place. Biochar was one component of this successful system for restoring vegetation on mine waste. ⁶

Biochar can also help keep nutrients in the root zone. Soil-column research found that selected biochars reduced ammonium losses through drainage. Retention was more consistent for ammonium than nitrate, showing how biochar’s properties influence the nutrients it holds. ⁴

Putting Biochar’s Benefits to Work

Water retention depends partly on where biochar is placed. In greenhouse research, mixing juniper biochar into soil slowed initial drying and increased seedling growth; a separate surface layer did not deliver the same benefits. ⁷ A formulated, stabilized hydroseeding mixture differs from a loose layer of biochar alone. In the video, Bob describes using mulch and materials that hold the mixture in place—an important part of applying biochar at the surface. ⁵

Successful hydroseeding combines suitable materials with prepared soil, appropriate nutrition, and enough water during establishment. ⁸ Biochar gives contractors and landscape managers another useful ingredient for building that growing environment, backed by successful use and research on plant establishment.