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
1 rating

Friday - August 01, 2008

From: Bozeman, MT
Region: Rocky Mountain
Topic: Invasive Plants
Title: Wild mustard growing in disturbed ground in Montana
Answered by: Barbara Medford

QUESTION:

I have recently planted "plugs" of wildflowers in beds throughout my yard. Because the soil was disturbed, I now not only have some beautiful wildflowers growing, but also mustard plants growing in the wildflowers. And lots of them! Do I need to weed out the mustard plants this year? Or will they die back naturally and the wildflowers will take over next year? Will they compete with the wildflowers for moisture and light? Do I need to even worry about mustard plant invading my beautiful wildflowers? Thanks-

ANSWER:

First of all, it took us a while to discover just what plant wild mustard is. There are so many common names and synonyms for it that it was very confusing. However, we finally established that Sinapis arvensis is the common weed that is most likely infesting your garden. The first thing we want to say is YES, get rid of the mustard plants and do it quickly, because now is the time they are seeding out. They are very difficult to get rid of because they have establish a long-lived seed bank of their own. Pull them out and dispose of them so that their seeds will not spread. Apparently, they generally only show up in disturbed ground, as you pointed out, but although they are native to the Meditteranean area, they now show up all over the world, and appear in all states of the United States, including Hawaii and Alaska. They are classified as a noxious invasive in several western states. They are said to be poisonous to livestock once their seedpods are formed. Many of them harbor an eelworm that attacks other crops, therefore it is best not to grow them in a garden setting. In a word, they've got to go.

Wild mustard is considered a winter annual, which means it will bloom and seed in cool weather, but in Montana, it may very well do so in the Summer. See this website from the University of Missouri Extension on wild mustard.

The wild mustard not only will shade out and crowd out your other plants, but their seed distribution will only make the problem worse. They will not "die back naturally". They are annuals just as most of your wildflowers are, but you need to stop them before they seed. They are not altogether unattractive and if a few get by you and bloom next year, that's not a disaster. But don't let them seed.

Images of Sinapis arvensis.

 

More Invasive Plants Questions

Information on various plants from Alamo TX
November 15, 2009 - Have you heard of the following plants: Butterfly Iris,Compact Nanpina, Red Dwarf Turks? I would like to know some details on the above plant: size, flowers?, drought tolerant, where to plant Thanki...
view the full question and answer

Dead-appearing Royal Paulownia trees in Manteno, IL
May 02, 2009 - Have two Royal Paulownia trees two years old.Last fall all leaves fell off. Have two eight foot toothpicks. This spring, nothing happening.Are they dead or will they come back? If they come back what ...
view the full question and answer

Will native plants become invasive from Grapevine TX
February 23, 2013 - Main Question - I want to convert my front and back yards into a native plant sanctuary but worry about if these plants growing out of control/invasive and if neighbors will complain about these "wee...
view the full question and answer

Do Salvia coccinea and Salvia occidentalis occur in Hawaii
April 27, 2008 - Aloha, Would you please happen to know if the salvia occidentalis and the salvia coccinea are growing in a wild state in Hawaii, the quantity (small or large areas? What are the weather conditions ...
view the full question and answer

Native plants for shade in Ennis TX
August 26, 2011 - My house faces south. The southwest side of the front yard has a Pride of Houston, Japanese Barberry, 2 crape myrtles and some dwarf yaupon hollies. The other section, divided by a stairway to the p...
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