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The University of Minneso... #223091

Asked December 24, 2014, 6:06 PM EST

The University of Minnesota Extension in the Planting under Canopy section of a report titled "Protecting Existing Trees During Construction" states the following: "Avoid cutting roots from one inch diameter and up. If roots are encountered, move plant hole over a few inches, or until you can dig without encountering large roots." Does this advice given to Minnesota residents to avoid cutting roots one or more inches in diameter also apply in Montgomery County, Maryland? The tree I am specifically asking about is a healthy, old Tulip Poplar. Thank you Phil Gilliam from Chevy Chase, Md.

Montgomery County Maryland

Expert Response

Thank you for the opportunity to answer your questions.

Yes these general rules apply to our region of Maryland also. Good tree health relies on a strong root system. A mature Tulip Poplar tree can live much longer when roots are not damaged. When roots are damaged it can set the tree up for further decline that can cause loss of the tree.

One can find practices similar to this used when doing new home construction, trees will be fenced off to protect the roots from not only cutting damage but also compaction damage.

If I can offer any additional information please do not hesitate in contacting me directly.<personal data hidden>.

An Ask Extension Expert Replied January 03, 2015, 9:11 AM EST
Thank you for your response. Does cutting mature Tulip Poplar tree roots between one and two inches in diameter damage the roots in a way that "can set the tree up for further decline that can cause" tree loss?  

Phil Gilliam 
The Question Asker Replied January 03, 2015, 4:19 PM EST

Cutting, damaging Tree roots of 1 to 2 inch diameter can most definetely cause tree declilne and set the tree up for decline, leading to death.


An Ask Extension Expert Replied January 04, 2015, 1:29 AM EST
Thank you for your response. What well-established source(s) would you recommend that I read so I can learn more about the impact of cutting Tulip Poplar roots of 1 to 2 inch in diameter? Also, how long does the period of decline last?

Phil Gilliam  
The Question Asker Replied January 05, 2015, 5:08 PM EST

Many factors play into the amount and length of time that decline can occur. Decline can lead to death. Depending upon the size of the area disturbed, the number of roots cut etc. Can you explain what you are trying to do so I can better target my responses? You already have quoted your own sources , but as we look at the types of damage done with transplanting, with construction related damage, sidewalk renovation they all are different.  

Remember that the older the tree the greater the risk that a disturbance can cause.


An Ask Extension Expert Replied January 05, 2015, 5:16 PM EST

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