En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Is Asclepias incarnata poisonous to dogs?

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

Wednesday - June 13, 2012

From: Devon, PA
Region: Mid-Atlantic
Topic: Poisonous Plants
Title: Is Asclepias incarnata poisonous to dogs?
Answered by: Anne Ruggles

QUESTION:

Is Asclepias incarnata safe in a farm/yard with plenty of dogs running around? What happens if a dog eats the leaves or seeds or pods? Is eating any of these fatal to dogs?

ANSWER:

Butterfly weed, milkweed, chigger-plant these are all common names for the plants of the genus Aesclepias which includes A. incarnata  which you ask about. In short, yes, the genus is poisonous. All parts of the plant are poisonous.

According to many sources including North Carolina State University, the University of Pennsylvania School of Veterinary Medicine, the ASPCA, and the Wildflower Center, all parts of the plant are poisonous in “large quantities.” It appears that livestock are most likely to ingest the plant.

Clinical signs of poisoning include profuse salivation, incoordination, and violent seizures. Early signs of poisoning are followed by bradycardia or tachycardia, arrhythmias, hypotension and hypothermia.  Death may occur from 1-3 days after ingestion.

However, the plants are premier food sources for butterflies, especially for Monarch butterflies. In the mid 1800s, naturalists observed that birds avoided eating butterflies whose larvae fed primarily on milkweed. It was later shown that the feeding larvae accumulated emetic cardiac glycosides that were retained and even concentrated in adult butterflies. Birds that ate the butterflies containing these glycosides vomited shortly after feeding and learned to avoid butterflies having the pattern typical of Monarch butterflies. Viceroy butterflies have evolved the ability to mimic the monarch’s appearance thus avoiding predation by birds who mistake the mimic for the distasteful monarch. 

 

From the Image Gallery


Swamp milkweed
Asclepias incarnata

More Poisonous Plants Questions

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

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

Wintering over an Angel Trumpet in Kentucky
September 20, 2008 - I have an Angel Trumpet on my deck in LaGrange,Ky -Can I plant it out in the yard now or do I have to take it in the house for the winter- It is 5 feet tall and I have no room in the house! Help!-Than...
view the full question and answer

Is arborvitate (Thuja sp.) safe for horses
May 16, 2010 - Is arborvitae poisonous to horses? I want to plant it along the horse pasture. If it is poisonous, what are similar plants that are not poisonous to horses?
view the full question and answer

Can oleander poison the ground below it?
June 29, 2013 - Can oleander poison the ground below it? Would it kill/damage grass or other plants below it? 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