Explore Plants

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
    
 

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

Sunday - September 16, 2007

From: Pflugerville, TX
Region: Southwest
Topic: Invasive Plants, Trees
Title: Flashing barrier to Bermuda in tree bed
Answered by: Barbara Medford

QUESTION:

I'm building a 6-ft-diameter planting bed on a gentle slope on blackland clay, at the center of which I plan to install a cedar elm. I'm using the wedge-shaped stones from the home-improvement store and plan to raise the soil a couple of inches and level it inside the bed. I have also installed 10" flashing inside the perimeter in hopes of impeding the evil bermuda, but now I am wondering if that will also impede the roots of my tree and cause them to circle. Should I remove the flashing and fight the grass some other way? The flashing would be 3 feet away from the trunk in any direction.

ANSWER:

The flashing, especially 3 feet away from the roots of the Ulmus crassifolia (cedar elm), should not cause any problems with the tree roots. After all, when you see the damage that is wreaked by tree roots on sidewalks, foundations, sewer lines, etc., why should a little piece of metal bother it? Actually, the only time you have to worry about roots circling is when the plant stays in a confining pot too long. If you purchase the tree in a pot, be sure and check before the tree goes in the ground. If, indeed, the roots are circling or "girdling", do some root clipping (and you can be pretty ruthless) to force the roots to spread. By the time the roots get to your metal flashing, they will be perfectly able to dive under and continue their progress. And, sorry, but it's doubtful that the flashing is going to be much of a deterrent to the Bermuda grass, either. With above-ground stolons and below-ground rhizomes questing for fresh territory, it's tough to block out. But, hey, anything is worth a shot, and your idea seems sound. If it works, let us know.

 

More Invasive Plants Questions

Pruning of Grape Kool Aid Plant in California
August 03, 2008 - I have a Grape Kool Aid plant and was told it would grow to 6 or 7 feet tall, but it is well over that and I need to know if I can prune it and if so how?
view the full question and answer

Removing bermudagrass from buffalograss in Smithville TX
May 01, 2013 - I have a lawn created two years ago with buffalo grass sod in Smithville, TX. Recently several areas of bermudagrass have started to flourish in the buffalo grass lawn. Can you recommend a herbicide...
view the full question and answer

Non-native, invasive Asiatic Jasmine from Austin
October 25, 2012 - Is Trachelospermum asiaticum considered a native texas plant? Is there an example growing at the Center that can be viewed?
view the full question and answer

Identity of plant in Kentucky with fuzzy grayish-green leaves
September 03, 2012 - I would like to know about a plant that I do not know what it is. I had this plant just come up in my flowerbed, that looked like a tobacco plant but the leaves looked like a lambs ear plant. It was ...
view the full question and answer

Control of King Ranch Bluestem (Bothriochloa ischaemum)
November 21, 2007 - What is the best way to get rid of King Ranch Grass (an invasive plant) on my half acre property? I felt like mowing just encouraged more seed heads to pop up.
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.