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

Saturday - July 13, 2013

From: Wallingford, CT
Region: Northeast
Topic: Pruning, Problem Plants, Trees
Title: Will catalpa roots damage a nearby swimming pool?
Answered by: Guy Thompson

QUESTION:

Will a catalpa tree cause problems to my swimming pool? It is 8 feet away and I cut all the branches off every fall. It then grows back to about 6 feet in diameter an makes a great garden feature but I am worried if it will hurt my pool. It is about 9 years old now. Thanks so much

ANSWER:

Most arborists would say that 8 feet is too close to your pool.  But I have not read of any case of damage to pools or house foundations by catalpa roots.  However, both the Catalpa speciosa (Northern catalpa), which I expect you have, or the Catalpa bignonioides (Southern catalpa) have extensive root systems.  My biggest cause for concern is whether your pool may have a hairline crack, leading to a slow seepage of water in the direction of the tree.  Tree roots tend to grow strongly in the direction of any water source.  So the first step is to inspect the pool for possible leaks.

I would suggest that at the time that you trim branches off in the fall you also dig a trench parallel to and about two feet from the end of the pool.  Trim off cleanly any tree roots that are growing towards the pool and bury some kind of root deflector to prevent roots from growing past that point.  These deflectors, or root barriers, can be found advertized on the Internet.  I have myself found this particular product to be sturdy.  Few large roots would grow towards the pool at a depth exceeding eighteen inches, so your deflector should extend to two feet below the surface.  To further reduce the chances of root problems, restrict any hand watering of the tree to the side away from the pool.

You are already aware of the positive and negative attributes of Catalpa trees. Trimming off the branches does prevent the dropping of seed pods during the winter.  With care you should be able continue growing your tree without harm to the pool.

 

From the Image Gallery


Northern catalpa
Catalpa speciosa

Southern catalpa
Catalpa bignonioides

More Trees Questions

Growth in oak tree in San Antonio
April 05, 2011 - We have a very large gorgeous oak tree in our backyard here in San Antonio, Texas. I noticed a thickness high up in the tree. Thinking it was a nest of some sort, I used binoculars and saw a parasiti...
view the full question and answer

Tree with tap root for small area
August 24, 2008 - Dear Mr. Smarty Plants: I'm looking for a tree with a tap root to plant for shade on the side of my patio. i have about a 4 foot area to plant in and it's 8 feet to my neighbors house. ..maybe somet...
view the full question and answer

Gardening advice for Quebec
April 15, 2011 - I live in Aylmer Quebec 1. I bought some lily bulbs at a Christmas bazaar. When can I plant them and what do I put in the hole with the bulbs? 2. I bought a little potted cedar at COSTCO for a Ch...
view the full question and answer

Clipping of beans from newly planted Tecoma stans
April 22, 2008 - I purchased a Esperanza Plant in a pot from a nursery in April of 2008. We planted it and it is doing fine, but came with blooms and beans. Do I need to do clip or prune the beans at this stage of g...
view the full question and answer

Destructive landscape crews in The Woodlands TX
October 20, 2012 - Hi. We need help. We recently moved to a house where landscape crews have been blowing away the leaf litter from the front yard for many years. The underbrush was also cleared long ago. The result...
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