This perennial weed is notoriously difficult to control and is found mainly in lawns and thrives where the soil is sandy or acidic. The presence of yarrow usually indicates the lawn is in poor condition.The foliage is grass like and the edges are fringed with long, clear hairs. Small brown, shiny flowers are produced from April to May, but these will not be seen if the lawn is regularly mowed.
The main way to keep weeds under control is constant vigilance, never allowing the weed to flower or seed and mulching.
Maintain a healthy lawn – scarifying, aerating, feeding and top-dressing in autumn will help
Spray with a systemic weedkiller that is absorbed through the leaves of the plant, the active ingredient makes its way through the cells of the plant down to the root. It kills these first and then the foliage starts to die off.
Use a nitrogen-rich fertiliser in spring