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
18 ratings

Sunday - July 27, 2008

From: Lake Francis, MB
Region: Canada
Topic: Poisonous Plants
Title: Plant with poisonous thorns
Answered by: Nan Hampton

QUESTION:

Is there a bush or tree out there that has thorns on it that can make you swell and cause you to feel like you can hardly move you're whole hand.

ANSWER:

I searched the Canadian Poisonous Plants Information System for such a plant in Manitoba. I found the following two plants with stinging hairs which might be considered very small thorns, but I could find nothing with large thorns that has the effect that you mention.

Laportea canadensis (Canada nettle) has stinging hairs that can cause pain and discomfort. Here are photos and more information.

Urtica dioica (stinging nettle) also has stinging hairs that give a painful sting, swelling, itching and numbness. More information and photos.

If you didn't actually see the thorn or thorns that caused this, you might consider that you were bitten by a spider or stung by some insect.


Urtica dioica

 

 

More Poisonous Plants Questions

Pruning non-native oleanders
September 28, 2011 - I have an oleander that has become to "leggy". I read the pruning instructions, but where I want to prune, there are not any leaf nodes. Can I trim below at the base, or will I hurt the plant? I ...
view the full question and answer

Is Loropetalum poisonous to horses in Lake City FL?
October 26, 2010 - Is loropetalum poisonous to horses? I know it is a member of the witch hazel family but cannot find a definitive answer about loropetalum itself. Thank you!
view the full question and answer

Curing plant rash
September 02, 2008 - I went walking in the woods a few weeks ago, and my leg swiped some kind of cactus or something. It scratched me up and I had to remove little white spines with tweezers. I developed an intensely itch...
view the full question and answer

Searching for poisonous plants from Kansas City
November 13, 2010 - Looking on how to acquire wourali vine, upas, or arrow poison wood.
view the full question and answer

Can animals eat bottlebrush buckeye without being poisoned?
June 13, 2013 - Can deer, bear and wild turkey and squirrels eat the nuts and leaves from the bottlebrush buckeye shrub without being posioned by it.
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 | STAFF
© 2015 Lady Bird Johnson Wildflower Center