En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Further explanation of retaining walls and trees from Washington MO

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

Monday - March 11, 2013

From: Washington, MO
Region: Midwest
Topic: Erosion Control, Trees
Title: Further explanation of retaining walls and trees from Washington MO
Answered by: Barbara Medford

QUESTION:

I had a question previously about putting retaining walls across the root system of a 40' tall bald cypress tree(not like spokes on a wheel, but concentric to tree trunk). How wide can the walls be? How deep can the dirt backfill behind the walls be? How far away from the trunk should the walls stay? I am only asking how to minimize stress to the tree, not how to engineer it. My choice of words gave you the wrong direction to proceed with your answer. Please address only the plant/tree issue for me.

ANSWER:

Sorry we got so wrapped up in the rain garden issue we forgot the tree root issue. In fact, we had a reference to tree wells in our original answer and removed it because the answer got so long. For anyone interested in seeing how we goofed up, here is your previous Mr. Smarty Plants question.

Basically what you are asking about is Tree Wells. This article, we believe, actually addresses the questions you have, and much better than this mathematics-challenged gardener could. It has diagrams, a discussion of grade changes, the distance a wall  should be from a tree trunk, weep holes, etc. Since you can actually see your tree, the incline and soil type, hopefully this will answer all the questions we did not.

 

More Erosion Control Questions

Plants to stabilize sandy slope in Massachusetts
September 23, 2011 - Dear Mr. Smartypants, I am working on a small public housing project in Chelmsford, MA, northwest of Boston. We have a steep, sunny and SANDY slope and I am stumped as to what to recommend that wi...
view the full question and answer

Dealing with rain runoff on a slope in Austin
March 24, 2012 - Our lawn is a year old and slopes at about a 45 degree angle with a lot of small holes and tiny gullies from water run-off. I have tried packing them with soil, but it washes away in the rain. Would ...
view the full question and answer

Deer resistant plants for Pittsburgh PA
January 30, 2012 - What shrubs can I plant on a wet slope that gets partial sun that will help control erosion? They need to be something the deer won't eat! We have lots of deer.
view the full question and answer

Need to Stabilize River Bank in Kentucky
December 20, 2011 - My home borders the Ohio River. I have lost a great deal of soil to the river. I am looking for plants with tight root systems that are water tolerant to protect my shoreline. Thanks
view the full question and answer

Plants for erosion control on steep bank in Minnesota
October 21, 2008 - I live in the Twin Cities of Minnesota. I have a steep slope in back yard which gets considerable rain runoff from the homes above me. What plants/shrubs/trees could I plant on the slope to stop the...
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