Host an Event Volunteer Join Tickets

Support the plant database you love!

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

Please forgive us, but Mr. Smarty Plants has been overwhelmed by a flood of mail and must take a break for awhile to catch up. We hope to be accepting new questions again soon. Thank you!

Need help with plant identification, visit the plant identification page.

 
rate this answer
Not Yet Rated

Sunday - November 22, 2015

From: Bakersfield, CA
Region: California
Topic: Non-Natives
Title: Containing Japanese Wisteria Roots
Answered by: Anne Van Nest

QUESTION:

I have some Japanese wisteria plants that I would like to plant inside root barriers but I cannot find any info on how deep the roots go. Do you know if a 2 ft deep root barrier for trees can contain wisteria roots?

ANSWER:

Francesco Vignoli on his Wisteria website has this to say about the roots: The wisteria roots spread so strongly and abundantly that if planted near walls or pavements they can easily grow into them causing serious damage. To prevent this from happening it is advised, whilst planting, to insert a corrugated plastic panel which will force the roots to take other directions, as they are unable to pass through it. Place the plastic panel (at least 2m long) 80cm deep, between the plant and the wall or pavement (or the surface to be protected). In the case of walls and pavements made with cement this problem does not exist.

He recommends a barrier that is almost 3 feet deep on his Wisteria website.

Also, Barbara Medford has answered a question about planting non-native wisteria near a well or septic system (a similar situation) that you might want to read. Her answer is found here.

 

More Non-Natives Questions

Disease on non-native French hollyhocks
April 16, 2008 - I live in Georgetown, Texas. I have some French hollyhocks that have some kind of disease on the leaves - I would like to know what to spray them with to get rid of it. It looks like brown blemishes...
view the full question and answer

Comment on previous answer from Austin
October 15, 2013 - Ms Bradford, You just answered my question about St. Augustine grass.. actually, you didn't answer it.. You said "sorry, wrong number". Very funny. I think you misunderstood... I would rather no...
view the full question and answer

Non-native Japanese red maple exposed to full sun
August 16, 2008 - I planted a Dwarf Japanese Red Maple tree about 3 yrs ago. Until about a month ago it was partially shaded by a massive chestnut tree, that has since been cut down. Now the new growth on my tree appea...
view the full question and answer

Ground cover for Central California from Concord CA
July 19, 2012 - I live in a part of California where the summers can be very hot and dry but quite cool and wet during the rainy seasons in the wintertime. The soil around my home is very dry, rocky and infertile. I...
view the full question and answer

Native replacement for bamboo from Houston
May 21, 2013 - I've read one reply where you do not advise using Bamboo as a privacy fence plant. What do you suggest in its place? The suggestions on the one I read will not work for me. Your suggestions were My...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.