Q. What is your opinion of pines as landscape trees in
our desert climate? We have quite a few planted in our complex and our HOA is
discussing whether we should get rid of them or not because of their liability
and water use. Our landscaper tells us they have borers.
A. I’m a little suspicious of the borer diagnosis in pine
trees since it is rare for them. Have that diagnosis confirmed with a second or
third opinion. Aleppo Pine gets a blight that causes browning of needles and entire
branches.
| Probably Aleppo Pine blight |
From a
distance this can look like borer damage. So far no one has discovered the cause
of Aleppo Pine Blight or how to control it but it’s thought to be related to
irrigation and not resulting from a pathogen or borers. Aleppo Pine Blight is
so common in the Las Vegas Valley that if a pine tree has brown branches, it is
an Aleppo Pine, not Mondell.
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| Eldarica or Mondell pine will get dieback in some branches as well but not as well documented as afghan (halapensis) pine blight |
My
opinion of pine trees used for landscaping in the desert is mixed. I don’t
think large pine trees should be planted here but I do understand their light shade
value once they have become established and mature. What makes me hesitate is
their removal I’m not sure if the shade they produce is worth the extensive
deep watering needed to keep them healthy and upright against strong winds. In some
lower elevations in the Valley, these large pine trees with extensive roots may
have tapped into shallow groundwater which could help with irrigation and
staying stable.
Removing
existing, mature pine trees from the property will increase the resident’s electrical
costs used for cooling during the summer months. I would recommend that you
transition your landscape to smaller, desert adapted trees that shade the south
and west walls of your buildings and then possible pine removal. Once
established, their shade will substitute for the pine trees and help reduce
residential energy consumption.
It would
be far better to plant smaller pines such as pinion and Italian stone pine if a
pine tree is desired. Japanese black pine is sometimes recommended but look
around. Do you see any older Japanese black pine in the valley? Many have been
planted here. It doesn’t survive in the desert for any length of time so I
would discourage planting Japanese black pine here.











