En EspaŅol

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 - July 07, 2009

From: San Antonio , TX
Region: Southwest
Topic: Trees
Title: Distance of oak tree to existing driveway in San Antonio
Answered by: Barbara Medford

QUESTION:

How close can I plant a live oak tree (15 gal) next to an existing driveway. I have about 3 feet space to plant between a fence and a driveway. This is the best spot to provide future shade. My concern is if the roots will raise the concrete over time.

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. Paving should not be in the dripline and no closer than 15 feet from the tree trunk. The area around the trunk-at least a 10 foot radius-should be natural and uncovered.

Not only would your pavement begin to buckle, but the tree would not thrive, either. What is on the other side of the fence? The tree roots can go under the fence, but then is there another driveway or foundation? We would hate to see you go to that much trouble and expense planting such a large tree, and have it cause so much trouble down the line and probably lose the tree, too. Now that you know what kind of spacing the tree needs, perhaps you can find another place on your property where it will be able to grow without disruption of foundations, sidewalks, driveways or its own roots.

 

More Trees Questions

Companion plants for Douglas fir in Federal Way, WA
May 11, 2009 - What are good companion plants for large Douglas Fir trees? we have 5 large trees in our cul-de-sac "island" and would like to plant something colorful around the trees. It's very dry, shady, and c...
view the full question and answer

Japanese lilac trees in Lehi UT
July 31, 2010 - Dear Mr. Smarty Pants, We live in Utah and this past spring planted three Japanese Lilac Trees in the lawn next to the deck hoping they would one day provide some shade. They are planted in full sun ...
view the full question and answer

Sap dripping from redbud in Bertram, TX
March 03, 2014 - Our multi-trunked Texas redbud has sap dripping down 3 of the trunks. It seems to originate from a very small crack in each trunk. The tree is just starting to show pink this week, and is about to blo...
view the full question and answer

Pecan trees too close together in Austin
August 14, 2012 - There are two pecan trees in my central Austin yard. Each is four or five inches diameter at chest height and maybe 15 feet tall. They are within six feet of each other and their canopies interfere wi...
view the full question and answer

Replanting members of Rosaceae family in same spot
May 23, 2007 - HI Mr. Smarty Plants We had two apple (yellow fruit) trees besides out house and they died. Is it ok to replant in the same place with other trees without being afraid something is wrong with the soi...
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
© 2014 Lady Bird Johnson Wildflower Center