Should you put mulch around the base of a tree?
Trees, especially young ones, typically benefit most from a 2- to 3-inch layer of mulch around their base. However, for the first 12 inches immediately surrounding the trunk, thin the mulch layer so that it just covers the soil. This will prevent the common problems associated with excessive mulching.
How should mulch be placed around trees?

Make sure the mulch is at least 5 inches away from the trunk of the tree and no more than 2 to 4 inches deep. Spread the mulch around the tree into the surrounding landscape as wide as you like, tapering out to the ground level at the edge of the ring. Use fresh natural mulch such as wood chips or bark chips.
What is the best thing to put around trees?
Adding two to three inches of mulch around the base of new plants will help keep moisture in the soil so you won’t have to water constantly. Use either commercial mulch, such as pine straw or wood chips, or recycled dried leaves.
Should mulch touch the tree trunk?
Proper tree mulching. Never let mulch touch the trunk of the tree. Start the mulch layer on the ground about 4 to 6 inches out from the bottom of the trunk. The root flare, where the roots begin to enter the ground at the base of the trunk, should be visible after the mulch is spread.

Is landscape fabric better than plastic?
Although more expensive than plastic, landscape fabric breathes, allowing oxygen and moisture to circulate. This makes it a better choice than plastic for use near trees and shrubs.
Can you put mulch over exposed tree roots?
Yes, in fact, mulch is the best way to cover tree roots above ground. When you add 2-3 inches of organic mulch, you get double the benefits.
How big should a mulch ring be around a tree?
2-3 feet
Proper Mulching Mulch should only be 2-3 inches deep around your tree. Keep the mulch 1-2 inches away from the trunk. And extend the mulch ring a minimum of 2-3 feet around the tree (the drip line is preferred).
Is mulch really necessary?
Mulch is not strictly necessary. Its main advantages are keeping down the weeds (for this it *must* be thick enough) and adding organic matter that helps soil microbe life, etc, to thrive.