western-queensland-gardening-guide.pdf - South West NRM

Sand, gravel, crushed rock: A durable mulch effective for temperature control,
but not so good for weed control. Contributes no organic matter to the soil, and
can be expensive.
Mixed mulches: The above mulches can be mixed to offset the disadvantages of
mulches that repel water.
Mat mulches: Although easy to place, they are often inadequately secured,
leading to their early failure. It is important to at least secure the corners and
desirable to secure the edges as well. Pegs, rocks or soil are frequently used for
this purpose. Pegs can be made from short lengths of fencing wire bent into a "L"
or "U" shape (See Figure 15). There are a number of commercial mulch/weed
control devices based on paper or other fibre products.
1 I
mat mulch held down by pegs
Figure 15. Mat mulch held down by pegs
Newspaper, cardboard: Cardboard or 8 to 10 sheets of newspapers makes a good
mulch which should last a season. The soil surface under the paper should be
dished to collect water. The edges of paper should overlap and must be weighed
down to stop it blowing away. This can be done effectively with a layer of bulk
mulch. If soil is used to weigh it down, the paper will decompose more rapidly.
Hessian bags: Several layers of bags overlapping at the edges will provide an
excellent mulch. Must be well secured.
Old carpet, underlay: Makes a durable and effective mulch. ~ependi'n~ on its
composition it may or may not contribute organic matter. It can be difficult to
obtain and cut - try the local tip.