Geology vs. Pastry: Mulching Methods
It’s likely you’ve noticed two very different styles of mulch applied at the base of trees.
The first is sometimes described as “The Volcano”—thus the geology reference.
A mound of mulch is placed around the base of the tree, rising up to rest against the tree’s trunk while also extending several feet beyond the trunk. The mounded mulch prevents air from getting to the trunk and holds moisture against the trunk, creating favorable conditions for rot and insect infestation to occur.
The “Volcano”-style tree mulch rests against the tree’s trunk.
In contrast to the volcano-style tree mulch is “The Donut.” Mulch surrounds the tree trunk but is pulled away from the trunk, similar to the emptiness of a donut hole. This mulch does what all mulch does—retains moisture, slows weed growth, and provides a finished appearance, all without risk to the tree.
The “Donut”-style tree mulch is open for several inches surrounding the tree’s trunk.
When it comes to tree mulch, the donut is the clear winner. Pulling mulch away from the trunk avoids harming the tree while still delivering all the benefits mulch is meant to provide. Pastry for the win!