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
Not Yet Rated

Thursday - September 20, 2012

From: Austin, TX
Region: Southwest
Topic: Poisonous Plants
Title: Plants toxic to horses in Travis County, Texas
Answered by: Nan Hampton

QUESTION:

What plants/weeds are toxic for horses in Travis County?

ANSWER:

It would take a lot of space and a lot of time for me to list every plant with possible toxicity for horses in Travis County, but I can list some that are especially bad for horses or that are more abundant.  

First of all, here is an article from Equisearch with a list of the 10 Most Poisonous Plants for Horses.  Not all of those plants are common in Travis County or, when found, are not abundant. Here are the ones from that list that have been found there:

Conium maculatum (Poison hemlock), a non-native introduction.  Here is more information from Plants of Texas Rangelands.

Sorghum halapense (Johnson grass), a non-native introduction.  Here is more information from Plants of Texas Rangelands.

Astragalus crassicarpus (Groundplum milkvetch), Astragalus distortus (Ozark milkvetch), Astragalus lotiflorus (Lotus milkvetch), Astragalus nuttallianus (Nuttall's milkvetch), Astragalus plattensis (Platte river milkvetch), Astragalus pleianthus (Edwards plateau milkvetch), Astragalus wrightii (Wright's milkvetch) and Oxytropis lambertii (Purple locoweed).  All native.  Here is more information about Oxytropis lambertii (Purple locoweed).  Some of these are rare or don't occur in great abundance.

Nerium oleander (Oleander), a non-native introduction.  Here is more information from Plants of Texas Rangelands.

Centaurea melitensis (Maltese star-thistle), a non-native introduction.  Here is more information from Plants of Texas Rangelands.

Cicuta maculata (Spotted water hemlock), native.  Here is more information from Plants of Texas Rangelands.

The ASPCA has a list, Toxic and Non-Toxic Plants—Horses, that you should look through.  Not all those plants occur in Travis County or even in Texas.  You may see some names that you recognize, however.  [Note that the first part of the list is for "Plants Toxic to Horses" and the last part of the list is for "Plants Non-Toxic to Horses".]  Here are some that are on the list that do occur in Travis County:

Juglans nigra (Black walnut), native.  Here is more information from Pennsylvania Poisonous Plants Database.

Aesculus pavia (Scarlet buckeye), native.  Here is more information from Plants of Texas Rangelands.

Hedera helix (English ivy), a non-native introduction.  Here is more information from Poisonous Plants of North Carolina.

Nandina domestica (Heavenly bamboo), a non-native introduction.  Here is more information from Poisonous Plants of North Carolina.

Melia azedarach (Chinaberry), a non-native introduction.  Here is more information from Plants of Texas Rangelands.

Prunus spp. (Includes plums cherries, chokecherries, peaches, apricots, etc.), some native and some introduced non-natives.  Here is more information from Plants of Texas Rangelands.  There are domestic Prunus spp. (plums, peaches, etc.) but there are also native species that occur in Travis County:

Prunus caroliniana (Cherry laurel)

Prunus mexicana (Mexican plum)

Prunus minutiflora (Dwarf plum)

Prunus rivularis (Creek plum)

Prunus serotina (Black cherry)

This is an extensive list; but it isn't all plants that have some toxicity that your horse might encounter.  You should look through the list from the ASPCA and in Toxic Plants of Texas from Texas A & M AgriLife Extension for plants that might occur where you are pasturing your horses.  You can determine if they have been reported as occurring in Travis County by entering their scientific name (be sure it is spelled correctly) in the USDA Plants Database "Name Search" slot.  When you reach the species page, click on Texas on the distribution map to see the county distribution for the species.

 

 

More Poisonous Plants Questions

Groundcover for Orange County, Florida
April 14, 2012 - I live in Central FL (Winter Park)and I have a small, mostly sunny (no trees) backyard next to a large in-ground swimming pool which fills up with the leaves of my neighbor's oak trees. The backyard ...
view the full question and answer

Plant ID of unknown purchased plant from Boise ID
June 24, 2012 - Hi! I bought a tree that the sales person didnt know what it was. I thought it was a cherry tree and now after about 3-4 yrs I know it is but..How do I know if it is an ornamental tree or real fruit t...
view the full question and answer

Vine non-toxic to alpacas and dogs from Fowler CA
June 29, 2012 - We have alpacas and would like to plant a flowering vine on a backyard fence that adjoins the pasture. We live in Central California so we have many hot days during the summer and would like a plan...
view the full question and answer

Poison Ivy in Semi-wetland Massachusetts
June 27, 2013 - You answered this question for Tennessee, but I would like an answer for a Massachusetts semi-wetlands area: What can I plant to discourage poison ivy, or at least make it very clear that it is poison...
view the full question and answer

Lantana poisonous to people, animals
May 07, 2008 - Mr. Smarty Plants, I read your response to the woman with the cow eating her plants over her neighbors fence. Just so you know- Lantana is poisionous. To humans and cattle. You recommended it as a...
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