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
2 ratings

Friday - February 17, 2012

From: Audubon, NJ
Region: Mid-Atlantic
Topic: Pruning, Trees
Title: Roots in foundation of home in Audubon NJ
Answered by: Barbara Medford

QUESTION:

I live in an old house (almost 90 years old), and within the past year I have noticed in one area the concrete basement floor breaking. Today I finally made time to investigate. In these old houses it was fairly common to only have concrete 2" thick in the floor. When I removed the broken pieces I found a root 2" to 3" in diameter that caused the floor to break. There was a large black walnut tree more than 35 years ago that was removed, but now there are two silver maple trees (about 40 years old) in my neighbors yard that are about 45' from the floor fracture. The roots are green (wet) so I assume they are from the Maple Tree. I plan on cutting the root, but is there any more permanent solution to the roots? Quite frankly I could care less about the trees that are messy with leaves and spinners that the neighbor does not take care of.

ANSWER:

We have no way of knowing where those tree roots originated. An expert, on the spot, could probably recognize the species of tree from the root, but we are neither experts nor on the spot.  This article from the Morton Arboretum Tree Roots and Foundation Damage explains the problem far better than we can. The main point of the article is that the tree roots didn't start out to destroy your foundation; it started out looking for water. When the roots came to your foundation, they dipped down below the house looking for moisture. Having found it, they have a nice drink, pulling water out of the soil, and causing the soil to subside. The soil, which is the support for your house, started shrinking and, without that support, the cement started cracking.

If no sprouts of the long-removed black walnut tree survived, we think it can be exonerated from the blame. The maples, even 45' away from your foundation, are notorious for invasive roots. There are 12 members of the Acer, maple, genus native to New Jersey and we chose Acer rubrum (Red maple) as an example. If you follow the link to our webpage on the red maple, you will learn that it has high water needs, is know for invasive roots, and grows to heights of 40 to 60 ft. in cultivation.

A tree that grows very tall is going to need lots of space under ground (and not very far down from the surface) to gather sufficient nutrients from the soil, storing water and, perhaps most importantly, anchoring that tree in the ground. You have heard the expression "top-heavy" we are sure; apply that to a large tree and you can perhaps visualize a tree that topples in a wind or even if someone leans against it. And with an instinct for survival, tree roots stand up for themselves, or perhaps we should say "push up" because they will push up sidewalks and driveways, as well as crack foundations in search of water.Remember that roots are radiating out in all direction from that trunk for as much as 2 to 3 times the width of of the top of the tree.

So, it's reasonable to blame the maples in your neighbor's yard, but you can hardly make them cut down trees on their property, even though there is a good chance those roots are affecting structures on their property as well.

You are going to need professional help with your problem, and we recommend you follow the advice from the Morton Arboretum on confirming the damage is from tree roots, first, then removing the invading roots, and putting in a root barrier. Along the way, you also will almost undoubtedly have to have some foundation repair. A house that has lasted for 90 years is deserving of some attempt to preserve it and keep it stable.


 

More Trees Questions

Need small, fast growing trees for privacy screen in Buda, TX.
February 01, 2013 - Please recommend some small, but fast growing, flowering trees to plant along a western fence for privacy
view the full question and answer

Thoughts on non-native Italian Cypress in Austin
January 01, 2014 - I would like to know your thoughts on growing Italian Cypress trees in Austin Texas? We are looking to create a privacy screen(and prepared to pay more for mature trees to cut down the wait to grow...
view the full question and answer

Are white pine trees toxic to horses?
May 31, 2009 - Are white pine trees toxic to horses?
view the full question and answer

Small Yard Tree for Washington DC
July 20, 2012 - What do you suggest for a tree or shrub in my front yard? The yard is small; 9 ft x 12 ft. Thank you.
view the full question and answer

Lantana trees in Wyoming MI
August 16, 2010 - We love lantana with its multicolored flowers. This weekend we visited Michigan State University and saw "lantana trees".They were amazing!! Have these trees been grown from the annual plant we have...
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