Thatch is the buildup of decomposing blades of grass. It's the grass your
lawn mower cuts off. A regular lawn mower cuts a blade of grass off in one
cut. A mulcher-mower cuts the blade of grass many times, to help speed up
the decomposition of the cut grass, or "thatch". It is good to leave the
cut grass on the lawn, as it returns valuable nutrients, most notably nitrogen.
A problem occurs, when there is too much decomposing grass in your lawn.
Thatch builds up, when the decomposition process is too slow in decomposing
the grass. Excess thatch is most common in spring to early summer, when lawns
are growing the fastest. Thatch then builds up into a thick, stifling layer.
Heavy thatch impedes the movement of nutrient and water to the roots of the
grass. Secondly, it can prevent the emergence and growth of new blades of
grass. It also can harbor plant disease that is harmful to your lawn.
De-thatching lawns helps in overall lawn growth and health, when thatch buildup
is excessive. De-thatching is the process of removing the cut, decaying layer
of dead grass. It's accomplished by simply raking out the thatch. If the
task of raking your lawn seems overwhelming, lawn care services can do it
In most cases, de-thatching need not be a regular lawn care chore. It only
needs to be done when thatch build-up is excessive.