Yesterday I walked with two clients while discussing their harshly sterile, bare, sloping side yard. Soil was eroding down onto the public sidewalk. It was slippery and muddy and very unattractive.
One of them brought up the idea of a nice boulder retaining wall set next to the sidewalk, which would help to hold back the soil.
The other remarked, “But that would cost a lot of money and we are not ready to spend that right now, even though it might solve a lot of the problem with our sloping, ugly side yard, and would look good to the neighbors.”
The slope was not so steep that it would not be walkable, and they could have installed a lawn to hold the soil back from washing onto the sidewalk. However, they did not want to plant grass. The idea of mowing a sloping side lawn, which they would not use, did not appeal to them. I suggested a much less expensive option of placing a 2—3 inch layer of bark mulch on the bare soil.
They wondered what I meant by mulch.
Mulch is any material placed on the ground which, when spread around in a fairly uniform layer, will insulate, protect or enrich the soil. Examples of mulch are: leaves, tree bark, compost, shredded paper, wood chips, wood shavings, shredded cardboard or nut hulls/shells.
Here are some examples:
Compost mulch
will enrich the soil by feeding its resident population of micro flora and fauna, preventing the bare soil from eroding, helping to retain moisture in the dry periods and suffocating weeds. It is a temporary fix, however, because most good compost will be quickly broken down and eaten by the micro flora and fauna. Its nutritional benefits will then be available to the roots of the plants underground, but the erosion protection, the retention of moisture and, particularly, the positive effect of the weed suffocation will be gone very quickly. It is a common mulch used around plants with a final layer of bark mulch placed on top.
Leaf mulch
is, as you may guess, a collection of fall leaves that will quite possibly last the winter and into early spring. They will provide erosion protection during the rainy season and, if they last long enough, into the early part of the dry season they will provide moisture retention as well. However, leaf mulch is also generally somewhat temporary. Shredded fall leaves or thinly placed grass clippings are excellent as far as nutrition goes, but it has an even shorter life span because this product is the most delicious to micro flora and fauna. The plus side is that feeding the micro flora and fauna will feed your plants!
Straw mulch/hay mulch
is occasionally available as an option. It is moderately slow to break down, but it carries many, many seeds. Therefore, it might best be used in a large commercial setting where there is a large expanse of soil that needs to be protected from erosion, but the owner is not picky about every kind of meadow plant imaginable germinating everywhere. This is not a product ever recommended for suburban planting beds.
Bark mulches
can be excellent on all accounts and comes in various colors, grind sizes and tree types.
Oregon landscape business license: #6111