Proper Mulching
Mulch is anything that will facilitate the improvement of the micro organisms
in the soil. Much has been misleading in mulch applications. I would like
to set some straight. First let us focus on trees. Anything with the word
FRESH in front of it is NOT GOOD. The relationship fresh material has with
the soil leaves us with the statement: "letting these materials sit
for at least one year is best." That is fresh chips, fresh manure
and so on. After one year, these things are fine in the right amounts to
be used as mulch. Tree trimmings are very good if applied after they have
sat for at least one year. Some places sell so called "mulch"
that is nothing more than just painted fresh chips(Not all). Mulch is too thick
when roots start growing into it. When roots are growing in the mulch, several
continuous hot dry days can lead to root death. Mulch is very beneficial for
trees. Start by applying 3 to 4 inches(7 to 10 cm.) and inspect the mulch
several times a year for root growth. Keep mulch at least 6 inches(15 cm.) away
from the trunk (A) to reduce chances of rodent injury and infection by
pathogens. Excessive amounts of mulch may disrupt soil moisture and aeration. It
is best to keep adding small amounts of composted material over time. The latter
are clips from 100 TREE MYTHS by DR. ALEX
L. SHIGO.
Mulch "should" extend to the drip line (B) and placing it
on top of the grass (FLAT) rather then removing the grass is better. We
can do more damage by removing the grass now that it is there. Grass roots grow
deeper than non-woody tree absorbing roots. We are over
grassed as a nation and grass will kill a tree. Only extending the much
out to four feet surly is better than no mulch at all! If we take "dead"
wood out of your trees, we can chip it up and place it right back around
your trees. Fallen leaves are great mulch. Bark mulch should be avoided.
Diagrams from The Desk of John A. Keslick Jr.
Call us for other FACT SHEETS on pruning and other tree care information.
John A. Keslick Jr.
Tree Biologist
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Text & Graphics Copyright © 2004 Keslick & Son
Modern Arboriculture
Some Correct Mulching Pictures