When moss appears in a lawn, it is easy to look for a way to kill the moss. Moss usually marks the conditions in which the grass is weak. If the same shade, compaction and excess moisture continue, the problem comes back even after you clear the surface.
Mark where water sits after rain
A few hours after heavy rain, walk the garden and mark where water collects and where your shoe sinks. The mossiest areas often match that map.
Insisting on grass under trees is not always sensible
Insisting on lawn under trees is not always sensible. Light is low, roots compete, and the surface can dry late. Turning some corners into a shade groundcover or a mulched bed can be more sustainable than repairing the lawn every year.
Aerating sodden soil can increase compaction
Heavy foot traffic can compact soil. When air and water move less freely, roots struggle. Aeration at the right time can help, but taking heavy equipment onto sodden soil can increase compaction.
Do not lime the moment you see moss
Liming as soon as you see moss is not right. Low pH is only one possible factor. Using lime without a measurement can raise a pH that was already suitable.
Cutting very short reduces leaf area in shade
Mowing constantly very short reduces leaf area, especially in shade. Mowing height suited to the species and the season should be thought about together with improvements to drainage and light.
