En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Lilac bush roots dangerous to house foundations

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

Wednesday - August 06, 2008

From: Ottawa, ON
Region: Canada
Topic: Non-Natives, Planting, Shrubs
Title: Lilac bush roots dangerous to house foundations
Answered by: Barbara Medford

QUESTION:

Are lilac bushes dangerous to the foundation of a house? There is a lovely white-blooming lilac that grows against the house outside my bedroom window. My ex-husband said that the roots would destroy the foundation and tried to kill the bush. It has come back, and I love the scent of the flowers coming through my window at night in the spring. Is it dangerous? I know willow tree roots are very invasive, and if the lilac is like that, I'll get rid of it. But I'm hoping it isn't.

ANSWER:

The common lilac, Syringa vulgaris, is a native of Europe and Asia; therefore, we have no information on it in our Native Plant Database. We can understand your wishing to keep your lilac, even though at the Lady Bird Johnson Wildflower Center we encourage the use of plants native to North America and to the area in which the plant is being grown.

We looked and looked and looked without finding anything about damage to a foundation from lilac roots. Since they won't grow in hot country like Texas, we have no personal experience with them. We did find information that growing them over a septic field was not a good idea. Finally, in an article by Ron Smith, Horticulturist for North Dakota State University Extension Service, Questions on Lilacs, we found this question and answer:

Q: I have lilac bushes that apparently are planted too close to the foundation of my house. I’ve been told to move the bushes so they don’t cause a problem when they get bigger (with the drain tile and the foundation). How do I remove the bushes? Can I replant them in another location? When is the right time to do that?

A: I doubt the lilacs will be a problem to your drain tiles or foundation. If you still want to move them, now is not a good time. Early next spring or late this fall, after the foliage drops, would be better.

 

 

More Non-Natives Questions

A method for killing nandina and ligustrum with herbicide
October 19, 2012 - Is there an effective herbicide that can be painted on the stumps of Nandina and Wax-leaf ligustrum to keep them from growing back? Thanks so much!
view the full question and answer

Tall plant with bell-shaped upside-down white flowers
July 18, 2014 - 2 tall plants grew outside my suburban New York house in June, blossomed late June. They looked like giant asparagus stalks, and the flowers were white, bell shaped, upside down, look like fairy skirt...
view the full question and answer

Care of non-native Easter lily, Lilium longiflorum
June 03, 2006 - I have a white lily that is in a pot and has already bloomed four flowers. will it bloom again? Can I replant this outside right now or what should I do with it?
view the full question and answer

Plants looking similar to Camellia sinensis in Venezuela
June 30, 2008 - Is there another plant that looks similar to the tea plant? I need to do a photoshoot of a tea plantation, but canīt really get to one, so I was wondering if there were other plants that at least look...
view the full question and answer

Non native crape myrtle changing bloom colors in Sonora CA
September 05, 2012 - I have a Red Rocket Crape Myrtle that was planted a little over a year ago. Last year the bloom was a beautiful deep red and this year it is a Mauvie pink. Is there something I can do to bring it back...
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