Straw wattles—also called fiber rolls, straw worms, or bio‑rolls—are cylindrical tubes made of clean, weed‑free straw (often wheat or rice) encased in biodegradable mesh (such as jute or polypropylene). They’re a simple yet effective Best Management Practice (BMP) for slowing water flow, trapping sediment, and promoting water infiltration on slopes, around storm drains, and across vulnerable soils. When installed, wattles are laid in shallow trenches (typically 2–6 in deep) along contour lines, staked every 3–4 feet, and overlapped tightly as needed. As runoff is intercepted, the straw absorbs moisture and filters out fine sediment, helping stabilize soil and reduce erosion by up to 80% compared to unprotected slopes. Beyond construction sites, wattles support revegetation—they slowly incorporate moisture and organic matter into the soil, creating favorable conditions for seed germination and plant growth. They’re typically effective for 1–2 years before biodegrading, after which the newly established vegetation usually sustains the slope.