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

Tuesday - January 22, 2013

From: LaGrange, TX
Region: Southwest
Topic: Problem Plants, Grasses or Grass-like, Herbs/Forbs
Title: Need help fighting grass burs in La Grange, TX.
Answered by: Jimmy Mills

QUESTION:

I have 4 acres of wildflowers planted in my front yard. Unfortunately, grassburs have crept in & I need to control them with a pre-emergent. Will this keep the wildflowers from blooming? Also, would like to apply a fertilizer, & the same question applies - will this affect my wildflowers?

ANSWER:

Grass burs have many common names, some of which we won’t mention in this space. There are at least 11 species listed in the USDA Plants Database, but the one you are dealing with is most likely Cenchrus spinifex (Coastal sandbur) (see distribution map) , or perhaps Cenchrus echinatus (southern sandbur) (see distribution map). 

Grass burs are considered to be summer annuals and can be controlled either chemically or mechanically. Pre-emergent herbicides offer a good means of chemical control of these weeds by preventing seed germination. Many of your wildflowers are also annuals however, so the timing of application is critical so you aren’t also preventing the wildflowers from germinating as well.

Mechanical control involves pulling (or digging) up the grass burrs before they flower and set seed. Cutting off the flower stalks before the seeds mature is also effective.

I’m going to refer you to a couple of links,  and a couple of answers to previous questions that will help flesh out these strategies.

The first link is to Texas AgriLife Extension, Aransas County Office, and has a thorough discussion of the problems and some cures for sand burs.

This link to Aggie-horticulture includes information concerning herbicide use.

These two answers to previous questions should also prove helpful

   #878

   #7105

Another source of help is the Fayette County Office of Texas Agrilife Extension.

 

From the Image Gallery


Coastal sandbur
Cenchrus spinifex

More Grasses or Grass-like Questions

Erosion at edge of driveway in Abilene TX
August 26, 2011 - My lawn suffered a great loss of grass over the winter and the soil at the edge of the driveway is washing away with watering and the occasional rains that we have. I am trying to get the grass to gr...
view the full question and answer

Drought-resistant plants for Paradise, California
January 23, 2009 - We are moving to a new home in Paradise, CA. What drought resistant plants do well in Paradise ? Thank you !!
view the full question and answer

Aggressive native Inland Sea Oats in Whitehouse Station NJ
April 29, 2010 - Can you direct me to a source of help managing a very aggressive grass, Chasmanthium latifolia, Woodland Oats or Indian Sea Oats. It is behaving like a very noxious plant and I am concerned as I am h...
view the full question and answer

Invasive Indian paintbrushes in Grawn MI
June 04, 2012 - I have lots of Indian paintbrushes crowding my lawn and taking over the grass..what kills it without killing the grass?
view the full question and answer

Retention ponds for states in southeast, from Greenville SC
July 14, 2012 - We provide maintenance for Stormwater detention ponds and are looking for native grasses to plant in the bottom and sides of typically dry detention basins. Prefer low growing grasses that spread to...
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.