Saturday, April 17, 2021


Colusa County Master Gardener’s Corner: Your trees and an arborist

TRIC in actionLately, the UC Master Gardeners of Colusa County have received calls about trees and hiring an arborist. Tree trimming companies may or may not have an arborist on staff. When you talk to the tree trimmer they may or may not be an arborist. The best way to know if you are talking to a certified arborist is to ask for their certification number. To find a list of certified arborists go to and click on “find an arborist”. I found 27 arborist within a 50 mile radius of Colusa.

Certified Arborists are individuals who have achieved a level of knowledge in the art and science of tree care through experience and by passing a comprehensive examination developed by some of the nation’s leading experts on tree care. Certified Arborists must also continue their education to maintain their certification and adhere to a Code of Ethics. Therefore, they are more likely to be up to date on the latest techniques in arboriculture.

Becoming an ISA Certified Arborist is a voluntary process through which individuals can measure their knowledge and competence required to provide proper tree care. ISA Certification is not government-sponsored or government-endorsed; it is administered by the International Society of Arboriculture as a way for tree care professionals to demonstrate their commitment to the profession and the industry.

Certification is not a measure of standards of practice. Certification can attest to the tree knowledge of an individual but cannot guarantee or ensure quality performance.

Proper tree care is an investment that can lead to substantial returns. Well-cared-for trees are attractive and can add considerable value to your property. Poorly maintained trees can be a significant liability. Pruning or removing trees, especially large trees, can be dangerous work. Tree work should be done only by those trained and equipped to work safely in trees.

The above is from the International Society of Arboriculture website.

Many problems we are seeing start with watering. Please water your trees. Mature trees need to be watered down to 3 feet. Most of a tree’s roots are in the top 3 feet. To accomplish this use a soaker hose, circle the tree several times. Turn the water on for 2-3 hours. Then check to see how far the water has saturated. Continue to water every 2 weeks.■

The Master Gardeners of Colusa County can be contacted by: Phone (530) 458-0570. Email office, 100 Sunrise Blvd., Ste. E, Colusa, on Tuesdays between the hours of 9:00 am to 4:00 pm.

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