Nutrient Replacement : Using organic mulch such as shredded wood is a great way to replace lost nutrients without fertilization. Through leaching, decomposition, and increasing the number of soil microorganisms, nutrients are released into the soil and eventually taken up by the plants.

Reverse Compaction: Mulch increases the porosity of the soil. By making the soil "lighter," plants are better able to expand their root zone, which increases the ability of the plant to take up water and nutrients. In many cases, the improved soil condition will reduce plant stress and increase their ability to fight off diseases and insects.

Soil Temperature : Mulch helps moderate soil temperature, making the soil cooler in the summer and warmer in the winter. This can be very important for plants that are shallow-rooted or are growing in dense soil. During freezing and thawing events, plants that have sufficient mulch will be less susceptible to "frost heave."

Soil Protection : In nature, exposed soil is quickly covered by organic debris or invasive ground covers. In the landscape, however, many of these natural covers are undesirable. Bare soil can be easily eroded away and UV rays from the sun can damage beneficial soil organisms. Mulching is a great way to protect your soil from this damage.

Weed Reduction: Mulch is a great way to naturally reduce weeds and the labor, time, and herbicides necessary to remove them. Mulch which is two to four inches deep can be effective in controlling weeds.

What Should You Do?
Check the depth of your mulch in the spring. If it is greater than two inches, you can leave it alone until next year. If it is shallow, you can spread a top-coat over the existing mulch. It is much less costly to purchase bulk shredded mulch than to buy bags. Sometimes it is a good idea to split the mulch and delivery charge with a neighbor who plans to do the same.

Special Mulch Tip
Maples like acidic soil. To help them better adjust and have better fall color, mix Pine needles into the mulch around the base of the trees.