Mulching your shrub beds will help
reduce weed growth, hold moisture in the soil and help rainfall and
irrigation water to penetrate the ground more easily.
There are several types of mulch you can use:
- shredded mulch
- mushroom manure
- decorative stone
- rubber mulch
- bark nuggets
"Yard"
of mulch
One cubic yard of shredded mulch is equal to
27 cubic feet. Therefore, to calculate how many "yards" of mulch you need
to cover a given area, find out the cubic footage by multiplying length x
width x depth (in feet).
Example:
An area 10 feet x 45 feet x 1-1/2 inch depth (.125 feet) =
10 x 45 x .125 = 56.25 cubic feet
56.25 cubic feet ÷ 27 cubic feet (one yard) =
2.08 cubic yards of mulch needed
More:
How
to calculate how much mulch you will need
|
One
cubic yard of mulch =
27 cubic feet
|
Shredded wood mulches
Generally speaking, finer ground
mulches (or smaller sized decorative stone) will provide more coverage,
since it can be spread thinner. With shredded wood mulches, a depth
of one to 1-1/2 inches should be adequate, especially if you plan to
mulch every year. Wood mulches stay looking their best if they are
top-coated every year (two years at the most). Beyond two years,
most of the mulch will have disintegrated and you'll be down to soil
or unsightly landscape fabric.
Applying mulch several inches deep year after year will lead to
mulch build-up. In some cases, you may have to remove some of the
old mulch layer before applying fresh mulch. Mulch should be held
back from contacting the trunks of trees and shrubs.
Landscape fabric or black plastic
weed barriers
Landscape fabric works well under
decorative stone mulches, but we don't recommend using it under
wood, bark or mushroom manure mulches. While it may serve well at
holding down weeds for the first couple years, weeds will eventually
begin to grow on top of the fabric. Also, a landscape fabric or
black plastic underlayment will prevent mulch from breaking down and
adding organic matter to the soil. Since any underlayment inhibits
the natural breakdown of mulch, it also contributes to mulch
build-up, where you may eventually end up with too deep of a mulch
layer. |