back

Gardening Tip: "No More Mulch Volcanoes"

You see them everywhere - shopping centers, housing developments and school yards. Huge quantities of mulch piled around trees like miniature Hawaiian volcanoes.

Many people realize the value of applying organic mulch. It helps control weeds, reduces moisture loss, reduces erosion and improves the appearance of plantings.

But mulching correctly is very important.

• A layer of mulch that is too thick prevents plant roots from getting enough oxygen. It can also lead to root rots or disease if soil remains water-logged because the excess mulch does not allow soil to dry.
• Mulch applied directly against the plant trunks or stems can create constantly moist conditions where disease can develop.
• Large piles of mulch around the base of plants provides nesting areas for rodents, who may feed on the plant and possibly kill it by girdling the trunk.
• Generally, mulch should be applied to a thickness of 2 to 2.5 inches. Apply the mulch at least 3 inches away from stems or trunks. Take care not to exceed the proper total depth when reapplying mulch in following years.

Source: Ohio State University Extension Fact sheet HYG 1083-96