Urban Forest: Past, Present & Future

Apr 6, 2015

600px-Abies_concolor_leavesIn order to grow strong trunks and limbs, Arborist-Treecare asserts, trees must be skillfully pruned.

Pruning branches decreases the weight on the individual branches allowing them to withstand wind, ice, wet leaves, as well as the weight of fruits and nuts. Trimming, if well done, creates “an overall balanced branch structure in terms of weight and shape,” decreases the risk of damage to home, cars, and people, and may minimize the spread of disease.

Some diseases, such as Dothiorella blight and Amillaria root rot are called “common diseases” according to California Arbor Care (CAC). Citrus greening, which is prevalent in northern California trees is classified as an exotic disease and Tristeza complex is a rare disease. Sometimes disease thrives on “drought stressed tissues/trees,” according to the California Pest Council.


Hollyleaf Cherry;

Hollyleaf Cherry;


Roots that have grown awkwardly or wrap around a tree trunk, which may “prevent transport of vital nutrients,” writes¬†Harri Daniel at Benefits Of, may be successfully pruned, too.

As California deals with the fourth year of drought, as well as disease and insect pests, pruning is essential to keeping our trees healthy and thriving.


Calocedrus decurrens leaves; photo by Jim Conrad

Calocedrus decurrens or California incense cedar; photo by Jim Conrad


On April 16th, Altadena Heritage has invited Frank McDonough of the L.A. Arboretum and Donald Hodel, environmental horticulturist for the University of California Cooperative Extension, to speak and “share how we can all help protect and revitalize our urban forest through good tree stewardship.”


Altadena’s Urban Forest: Past, Present & Future
Thursday, April 16th, 7-9 p.m.
Altadena Community Ctr., 730 E. Altadena Dr.
Free event; light refreshments


Quercus douglasii or California Blue Oak; photo by Benny White/Wikimedia Commons

Quercus douglasii or California Blue Oak; photo by Benny White/Wikimedia Commons




Photo, top right, of Abies concolor (white fir) by USDA-NRCS PLANTS Database / Herman, D.E. et al. 1996. North Dakota tree handbook. USDA NRCS ND State Soil Conservation Committee; NDSU Extension and Western Area Power Admin., Bismarck, ND. ([1]) [Public domain], via Wikimedia Commons



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