UCF Ask an Urban Arborist (FAQs)

The Arizona Department of Forestry and Fire Management has many tree experts on staff who are happy to answer any of your questions. However, before you contact us, see if your question is answered below.

What is an Arborist?

An arborist is a specialist in the care and maintenance of trees.

How does an Arborist differ from an ISA Certified Arborist?

ISA Certified Arborists are individuals who have achieved a level of knowledge in the art and science of tree care through at least three years of experience and have passed a comprehensive examination. They are also required to recertify every three years with a mandatory 30 hours of continuing education.

How deep should I plant my tree? 

The tree trunk flare (The area at the base of the trees trunk that becomes wider to form roots) should be just above grade approximately 1-2”. This will help as the tree will naturally settle.

Where should I be watering my tree? 

The absorbing roots of trees can spread 1 ½ - 4 times as wide as the canopy. They are also typically within 1 foot of the soil surface. Watering the entire root zone will serve your tree well; however, most of the water will be absorbed outside of the canopy drip line. 

How often should I water my tree? 

This of course varies by plant species and region; however, a good rule of thumb is to water when a soil probe (metal rod or even a screwdriver) won’t penetrate the ground more than 3-4 inches.

Where is the best place to make a pruning cut? 

Pruning cuts should always be made just outside the branch collar (area of overlapping wood fibers that connects a branch to its trunk or parent branch). It can be very harmful to a tree if a pruning cut is made flush with the trunk or parent branch.

How much is my tree worth? 

Trees provide numerous social, environmental, and economic benefits. Try out the National Tree Benefit Calculator to understand your trees value to the community.