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
1 rating

Friday - December 09, 2005

From: Auburn, IN
Region: Midwest
Topic: Trees
Title: Determining distance of trees from paving in NE Indiana
Answered by: Nan Hampton and Joe Marcus

QUESTION:

I'd like to plant 3 types of trees (Catalpa speciosa- Northern Catalpa; Juglans cinerea - Tulip Tree; and Acer saccharum - Sugar Maple) next to sidewalks and driveways, but need to know if they have roots deep enough to not break up the concrete/asphalt. I live in NE Indiana. Thank you.

ANSWER:

Although trees are generally divided into two groups by root type—tap root trees (such as oaks, hickory, walnut, conifers) and lateral, or fibrous, root trees (maples, ash, cottonwood)—this distinction is most evident as seedlings or saplings. Once the tree is planted and begins to mature, the distinctions between the root types become less pronounced. Then, the depth and lateralness of the roots is greatly dependent on the soil condition. Highly compacted soils, soils with low oxygen content and soils where the water table is near the surface are not likely to produce a strong tap root. Their roots are more likely to be lateral and located very near the surface with the majority of the roots located in the top 12 inches of soil. Also, it is important to realize that the spread of the roots can be at least 2 to 4 times greater than the drip line of the branches.

Sidewalks and Trees from Iowa State University Extension Service recommends basing the distance trees are planted near pavement on the mature height of the tree. Their recommendations are:

1. trees with a mature height of less than 30 feet, 3-4 feet from pavement,
2. trees with a mature height of 30 to 50 feet, 5-6 feet from pavement,
3. trees with a mature height of greater than 50 feet, at least 8 feet from pavement.

They also recommend installing root barriers underground between the tree and the sidewalk. Another recommendation from Iowa State is to avoid planting shallow-rooted trees near sidewalks. Unfortunately, the sugar maple (Acer saccharum) is on their shallow-rooted tree list. I am not sure whether you mean to plant the tulip tree, which is Liriodendron tulipifera, or the butternut, which is Juglans cinerea. If it is Liriodendron tulipifera, then that is also on the shallow-rooted tree iist. The butternut, Juglans cinerea, is not on the list, nor is the northern catalpa (Catalpa speciosa). You can read a list of recommended Trees for Parking Lots and Paved Areas from Virginia Cooperative Extension. Be aware that not all the trees on the list are native. The Lady Bird Johnson Wildflower Center recommends that you plant native trees. You can also read more about Tree Roots from Iowa State University Forestry Service.
 

More Trees Questions

Willow woes in Philadelphia, NY
August 22, 2010 - I have a 2 yr old willow; it is August and it looks like the tree has gone dormant, is this normal?
view the full question and answer

Why so many acorns in Houston?
November 16, 2009 - My son's home in Houston has a Live Oak. This year it has dropped MILLIONs of the seed pods. This hasn't happened in the nine years of living there. Is anything wrong with it? It looks OK but he ...
view the full question and answer

Sprouts from Sabal palmetto in Charleston SC
July 23, 2010 - I live in SC and have several palm trees (our state tree and symbol). The trees are wonderful, but my situation concerns the many, many sprouts that appear in the flower beds around the trees? Is the...
view the full question and answer

Pruning cherry laurel in January in Austin
January 07, 2011 - Do trust I checked Q&A first. Can Cherry Laurel shrubs be pruned earlier than late winter in Austin? I foolishly planted 12 native Cherry Laurel standards on our suburban property line 5 years ago. I ...
view the full question and answer

Location of pine trees for a wedding site in Grapevine TX
April 30, 2014 - Okay, I know this is a long shot. My daughter is getting married in Grapevine, October 18 at sunrise. She REALLY wants to have the ceremony near pine trees. Any suggestions for locations in Grapevine ...
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