|
Types of mulch
Organic
These are working mulches made of shredded organic materials, including tree bark,
wood chips, pine straw, compost, grass clippings, leaves, corn cobs, wheat straw,
newspaper or peanut hulls.
Inorganic
These types of mulches include inorganic materials such as lava rock, crushed brick,
river stone and pea gravel.
Geosynthetic
Geotextiles and landscape fabrics are also available for use as mulch. When using
geosynthetic fabrics, be sure to apply the material to bare soil.
Decorative
Organic decorative mulches are often colored and can add to the beauty of your yard, but
tend to be costly, and many are not made in Iowa. If cost is a concern, try layering decorative
mulch over a less expensive working mulch, and choose mulch produced in Iowa.
Poor choices
Avoid using materials such as black plastic when mulching. Plastic inhibits the flow of
air and water to soil which can be hazardous to shallow roots during drought or excessive cold weather.
Back to top
Mulching amounts
For best results, you will need enough mulch to cover the ground to a minimum of 3-4 inches deep, out to
the tree's drop line. Here's how to figure out how much mulch to buy:
|
- Measure the distance from the tree trunk to the drip line (see sketch to left).
- Square that number.
- Multiply by 3.
- Multiply by 0.33. This will give you the cubic feet of mulch you will need.
|
Back to top
Step-By-Step Instructions
- Apply your chosen mulch around the base of the tree in a 3 to 4 inch layer.
- Pull mulch away from the tree trunk, creating a donut shape. (Excessive mulch piled on the trunk
can attract rodents and retain excess water, promoting the spread of disease.)
- Mulch should extend at least to the drip line, and wider is better.
- Don't forget to check the mulch thickness periodically. Keep extra mulch on hand, and
add mulch as necessary to maintain a minimum thickness of 3 to 4 inches.
Back to top
DNR Contact
Matt McDonald
(515) 281-8150
Matt.Mcdonald@dnr.state.ia.us
|
