Contact Us Host an Event Volunteer Join

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

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

Tough, Non-toxic Vine to Cover Fence in Washington
February 16, 2014 - I have about 150 feet of 6-foot high chain link fence that I would like to cover with a vine for privacy. I really want an evergreen or semi-evergreen plant that requires very little care. I also don...
view the full question and answer

Natural fibers for lashing bamboo in weaving
May 07, 2008 - I live in Austin and am looking for plants I can use for weaving fibers, e.g. lashing bamboo for a small project. What plants and parts do you recommend? What resources do you recommend for informatio...
view the full question and answer

Wisteria and Non-Poisonous Native Vines
February 15, 2012 - I'm from central Texas and I'm wanting to plant a native vine that will work well around the public, mainly kids. It's a mostly sunny trellis that makes an arch. I'd like to plant the native Wiste...
view the full question and answer

Identification of shrub with red berries in Tennessee
January 24, 2014 - Hello, I've got a shrub in my backyard; it has leaves off in groups of 3 and it has multiple reddish berries in groups by the dozens. I'm not sure what plant it is. The shrub is stick-like and appr...
view the full question and answer

Are palm tree thorns poisonous?
January 27, 2012 - Almost 3 weeks ago I trimmed the fronds of my pygmy date palm. The tip of a thorn was stuck in my finger. I pulled it out. The side of my finger is still very painful and my finger is swollen. I c...
view the full question and answer

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