grassesand

Grassesand is a granular composite material used in horticulture and landscaping. It is typically described as a mix that merges coarse silica sand with organic matter derived from grasses. The result is a porous, lightweight substrate intended to improve drainage while providing some nutrient content from the organic fraction.

Composition and variants: The exact composition varies by supplier. Common formulations blend 60–85 percent sand by volume with 10–30 percent finely ground grass fibers or composted grass residue, sometimes with a small amount of binder or peat to stabilize the mixture. The material is designed to retain some moisture while maintaining air-filled porosity.

Manufacture and use: Grassesand is produced by milling collected grass clippings or other grass material into fibrous components, drying, and blending with screened sand. It is used as a growing medium for drought-tolerant plantings, container horticulture, green roofs, or as a cushioning layer in lightweight concrete infill systems. It may also be marketed as a decorative ground cover.

Advantages and limitations: The porous structure promotes drainage and root penetration, reduces soil compaction, and can help sequester a modest amount of organic carbon. Limitations include variability in composition, potential nutrient imbalance, and the need for regular management to prevent weed growth or microbial spoilage. Long-term performance depends on climate and maintenance.

See also: soil, sand, mulch, green roof substrates, horticultural growing media.