I really appreciate your help. It would be a shame to
lose these beautiful trees.
Jim
Jim
Cottonwood trees require lots and lots of water. I hope
these are not growing in a rock or desert landscape or you will have problems.
If you will be successful they should be growing in a large turfgrass area with
you supplying supplemental water to them deeply twice a month. This means not
only are they receiving water from the lawn, but you would be watering them
with extra water down to a depth of 18 to 24 inches twice a month during the
growing season. The area that you are watering under the tree should be
approximately the same area that is under the canopy or spread of the tree.
It is hard to judge but my guess would be that you are
getting branch dieback from a lack of total water applied to the tree. These
trees will not survive for any length of time if they are in drip irrigation. I
would highly recommend that these trees be watered with a bubbler that releases
large amounts of water quickly into a basin beneath the tree. This basin should
be the size I mentioned above.
I don't believe that there is anything wrong with this
tree that lots of water applied under the canopy would not cure. Watering
schedule during the summer months would be every 2 to 3 days. The frequency of
applied water decreases in the cooler months but the volume of water applied
remains the same... that water needs to travel in the soil to a depth of 18 to
24 inches beneath the tree.
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