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
Not Yet Rated

Wednesday - June 20, 2007

From: buda, TX
Region: Southwest
Topic: Plant Identification, Poisonous Plants, Vines
Title: Recognizing poison ivy
Answered by: Jimmy Mills

QUESTION:

I am having a difficult time identifying poison ivy. It seems so many plants look like poison ivy can you help me I don't want to kill everything but on the same hand I don't want to itch. Thanks for your help.

ANSWER:

"Leaves of three, better let be". This old aphorism is a good start for identifying the noxious weed (Toxicodendron radicans (eastern poison ivy), however the plant can be quite variable in appearance. Technically the "leaves" are leaflets, but they still contain the active principal urushinol that ellicits the allergic reaction in susceptible individuals.

Two plants that are often confused with poison-ivy are Box Elder Acer negundo (boxelder), and Virginia creeper Parthenocissus quinquefolia (Virginia creeper) . Close examination of the plants reveals that though the leaflets in all three plants seem similar, their arrangements are different. The Poison-ivy of course has leaflets arranged in threes; the Box Elder has five to seven leaflets per leaf arranged in a pinnate fashion, however there can be only three leaflets; and the Virginia Creeper has five leaflets per leaf.

This link is provided to let you "know the enemy", and this one offers some care tips if the ememy gets too close.

 

From the Image Gallery


Eastern poison ivy
Toxicodendron radicans

Box elder
Acer negundo

Virginia creeper
Parthenocissus quinquefolia

More Poisonous Plants Questions

Precautions to take with Jack-in-the-Pulpit, Arisaema triphyllum
September 13, 2009 - Are there precautions to take, such as wearing gloves while separating the seeds from the Jack In The Pulpit berries. The photos I have seen have gloved hands. I've read that the plant is toxic if in...
view the full question and answer

When will angels trumpet bloom in Vero Beach, FL?
May 31, 2009 - At what age or height will my angel's trumpet be able to produce flowers?
view the full question and answer

Allergy-causing plant in the Dallas/Fort Worth metroplex area
March 17, 2011 - Do you know what is growing (or floating in the air) in the DFW metroplex now, but not growing or floating the rest of the year? I have a 3 year old that has gotten extremely itchy this time of the ...
view the full question and answer

Petals of flowers on cake from London
August 28, 2010 - Hi could you confirm that Gemini, Lisianthus and Lilies are non toxic if positioned onto a fresh cream cake (stem will be paced into a vial but the petals will come into contact with the cream). Thank...
view the full question and answer

North American Plants with Poisonous Thorns
December 01, 2011 - Are there any plants in North America that possess poisonous thorns?
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