En Español

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
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

How to get Poison Ivy?
November 22, 2015 - I know this is a silly question but we have a lot of poison ivy in the area and I know that birds eat the seeds and berries, can you get poison ivy from bird poop or track it in the house? From shoes ...
view the full question and answer

Is Convolvulus equitans poisonous?
August 22, 2015 - Hello, Can you tell me if convolvulus equitans is poisonous? If so, can you tell me how poisonous and which parts are poisonous? I am considering putting this in my backyard but I have a dog and an...
view the full question and answer

Non Toxic Fruit Plants
April 03, 2015 - I am trying to plant on my backyard. My dog spends about 8 hours a day outdoors and I am afraid she will be poisoned. I am overwhelmed by the information of toxic trees\plants for dogs. However, I ju...
view the full question and answer

Are the leaves of the Fruitless Palm Tree poisonous in Redding California?
October 18, 2010 - Are Fruitless Palm Tree leaves poisonous? I was poked in the hand with a leaf of one of the branches. It was a dead leaf/Branch? Please Help!
view the full question and answer

Is Bignonia capreolata (Crossvine) known to cause skin irritation
July 23, 2013 - Is Crossvine (Bignonia capreolata L.) known to cause a rash? We are trying to identify the source of a rash-after-gardening, and have not seen any of the big three (poison ivy, poison oak, poison suma...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center