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

Sunday - March 20, 2011

From: Muskogee, OK
Region: Southwest
Topic: Non-Natives
Title: How to eradicate non-native invasive Houttuynia cordata from Muskogee OK
Answered by: Barbara Medford

QUESTION:

I have planted a very invasive plant called houttuynia and cannot get rid of it! It is very stinky and the stems break off easily at the roots. I cannot dig it up anymore - it is all over in my flower bed! Do you know of something I can spray on it to eradicate it - and not kill my other flowers!?

ANSWER:

Since this plant is native to southeast Asia, we have no information on it in our Native Plant Database. However, we are always interested in controlling or eliminating invasive plants, native or not. From a website by Ohio State University, we found this article on Houttuynia cordata, which indicates, among other things, that is is invasive because it spreads by underground rhizomes which, even if a small fraction is left in the soil, can still continue propagating. A wonderful argument for investigating the habits and nativity of any plant before you plant it.

Please, no spray! One of the things you will learn when you read the above link is that it seems to be resistant to many herbicides. We have a more or less standard operation that we suggest for trying (notice we said trying) to control invasive plants. Any spray you try will probably not faze the invasive, but will lay waste to all the broadleaf plants around, including your ornamentals. Buy some wide-spectrum herbicide and some small sponge disposable paintbrushes. Clip off every stem you can find emerging from the soil and then, quickly, within 5 minutes, paint the cut stub with the undiluted herbicide. You must do this right away because the stem will quickly begin to heal over to protect the rhizomes beneath. Of course, don't allow the plant to bloom and keep all leaves cut off in order to deny those rhizomes of the food they get from the leaves. Theoretically, in a perfect world, that would cause the rhizomes to starve to death. However, the way that plant became so invasive is by being very tough and adaptive, so you can't let up. Apparently, the plant is somewhat dormant in the winter, so that would be a good time to really make a digging assault on the rhizomes and be sure to dispose them where they won't root again! But you must persist and keep after the plant, constantly looking for sprouts in places you didn't expect it to be.

 

More Non-Natives Questions

Landscaping large area in Webster KY
February 10, 2012 - We just bought a house that we fell in love with. The land around it . . . well it has GREAT potential but is seriously lacking at the moment. Trying to get the farm up and running leaves very litt...
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

Problems with non-native windmill palm in Eden NY
May 29, 2009 - I have a potted windmill palm, about two weeks after being potted the leaves are turning yellow with brown spots on them. what have I done wrong?
view the full question and answer

Expected color of non-native crapemyrtles in Natchitoches LA
August 04, 2009 - just bought 8 new crepe myrtle trees that are suppose to be dynamite red in color. However, the few bulbs that are on them when you break them open they are white! Does this mean they are going to be ...
view the full question and answer

Care for non-native Desert Rose (Adenium obesum)
August 08, 2006 - I was given a desert rose and i'm looking for general information about planting, watering, how much sun it needs etc. I hope you can help. Thanks
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