I'll confess I don't fully understand the *actual*
benefit as I know Franz is *still* waiting for an
explanation (:-) but as far as I can tell it is
related to the osmosis of chalk in some way.....

Although..............
A patch of moss growing in your lawn is an indicator
of one or more of the following:

~ your lawn needs fertilization.
~ the area has poor drainage.
~ the soil is too acidic to support turf grasses.

But..........read on..........

Before you get out the fertilizer and soil amendments,
consider starting a moss garden.
Moss gardens are fairly easy to grow,
unusual to look at and have become
increasingly popular in recent years.

Alan