Where weeds cluster, the soil is telling you something: low calcium, low magnesium, low phosphorus, low pH. Mineral amendments aren’t like fertiliser; they don’t “run out.” They are slow‑release amendments that change soil chemistry over months, not days. Once it’s on the ground, it dissolves into the soil profile. Mineral amendments are cumulative. Every handful you throw is another nudge toward better pH, better calcium, better magnesium, and stronger perennial grasses.