Q.
I have a 20 plus year old eucalyptus tree. The leaves are very yellow. What is
the cause of this?
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| Its not a simple answer when it comes to yellowing eucalyptus. Could be anything. Judging from the plants around it and recent water restrictions I am wondering if it is water related. |
A.
Yellowing leaves can mean many things. It could be a nutritional problem, watering
issues, or damage from insects or disease. I need more information as well as
leaf and tree pictures. Make sure it gets an iron application to the soil in
the spring. To be on the safe side, apply an iron chelate such as EDDHA.
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| This is the iron chelate called iron EDDHA. Because of its chemistry it performs well in all soil pH if applied in the spring. |
Check for a watering issue or a leak
that floods the soil in that area. Eucalyptus is “mesic” in their water use so an
application frequency for large trees should be used. When water is applied it
should be deep and wide or large shrubs that receive water should be located
under its canopy. Once a tree is chosen its increasing water use as it gets
bigger has also been chosen.