En EspaÑol

Q. Who is Mr. Smarty Plants?

A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.

Help us grow by giving to the Plant Database Fund or by becoming a member

Did you know you can access the Native Plant Information Network with your web-enabled smartphone?

Share

Ask Mr. Smarty Plants

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
    
 
See a list of all Smarty Plants questions
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.
 
rate this answer
Not Yet Rated

Tuesday - December 16, 2008

From: Nashville, TN
Region: Southeast
Topic: Trees
Title: Distance from existing oak trees to place paving
Answered by: Barbara Medford

QUESTION:

We are designing an expansion for an existing veterinary office and the desired side for expansion will require addition to the parking and drive aisle to the back side of the property. My question is this, how close can we install pavement to two existing oak trees (both trees have 60”+ DBH). Thank you for your time and effort in your response.

ANSWER:

An oak tree root system is extensive but shallow. The ground area at the outside edge of the canopy, referred to as the dripline, is especially important. The tree obtains most of its surface water here, and conducts an important exchange of air and other gases. Any change in the level of soil around an oak tree can have a negative impact. The most critical area lies within 6 to 10 feet of the trunk. No soil should be added or scraped away from that area. Construction activity is a great threat to trees. Do not allow any parking within the dripline or piling of materials, waste, etc. in that area.

Paving should be kept out of the dripline and no closer than 15 feet from the tree trunk. If at all possible, use a porous paving material such as brick with sand joints, open bricks, bark, gravel, etc., which will allow some water penetration and gas exchange. Even with porous paving, the area around the trunk-at least a 10 foot radius-should be natural and uncovered.

We realize these are difficult restrictions, and your construction crews will not be happy. However,  you will need to make a choice between the trees and the construction. If you fail to make provisions for the needs of the trees, even if the trees appear to have survived, they probably have only a few years before they succumb to disease or starvation. 

 

More Trees Questions

Evergreen groundcover under pine tree in NY
May 23, 2008 - Hello! I live in upstate NY. I'm trying to find an evergreen ground cover to plant under a pine tree. I believe it's a white spruce (but I'm not postive). I've read conflicting information reg...
view the full question and answer

Apples, pears and geraniums in Kipling, Saskatchewan
March 30, 2013 - My geranium's leaves became yellow - Why? Where can I buy a good nice apple tree? Will apples and pears grow in south Saskatchewan?
view the full question and answer

Transplanting a redbud in Virginia Beach VA
April 21, 2010 - I have a 5-6 ft. Redbud Tree and like to dig up and move to different spot in my backyard. How/what is the proper way to do it without killing the tree?
view the full question and answer

Problems with non-native Chinaberry tree from Tucson AZ
September 05, 2013 - I have a 30+ year old Chinaberry tree and this year the branches are much sparser with leaves and there are a lot of small dead branches. Should I fertilize and what should I use? Thank you
view the full question and answer

Wildflowers that grow in woodlands
June 22, 2011 - Please tell me the names of wildflowers that grow under your oak trees in Texas. I am only familiar with those open meadow plants, not those that live under the deciduous trees. Thank you for your t...
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP | STAFF
© 2015 Lady Bird Johnson Wildflower Center