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

Monday - March 09, 2009

From: Pflugerville, TX
Region: Southwest
Topic: Poisonous Plants, Grasses or Grass-like, Herbs/Forbs, Trees
Title: Potential allelopathy of cultivar of Artemisia ludoviciana
Answered by: Janice Kvale

QUESTION:

I recently submitted a question regarding allelopathic potential of artemisia ludoviciana on rusty blackhaw viburnum, not specifying that I meant Vibernum rufidulum. Mr. SP interpreted my viburnum as Viburnum lentago, which is not what I have. Sorry for the confusion. Anyway, I read the USDA fact sheet and it did indicate further down that the cultivar of A. ludoviciana called Summit can be allelopathic. I don't know if I have this cultivar or not, but if so would it affect an established plant or only seedlings?

ANSWER:

Thank you for clarifying your information and giving Mr. Smarty Plants an opportunity to amend the reply. You are correct that the USDA identifies as allelopathic a cultivar of Artemesia ludoviciana called Summit. A comprehensive search of national and international research literature did not yield data to corroborate this information. Only a DNA analysis will identify the correct cutivar of your Artemesia. Mr. Smarty Plants guesses that this would not be an easy or attractive option to you. Chances are the artemesia is not toxic to a well-established plant, but you may be unwilling to take that chance with your two lovely native trees. If that is so, Mr. Smarty Plants suggests removing the Artemisia and planting a different ground cover between your trees. (You could move that Artemisia near something you want to get rid of and see if the Artemisia will do the job for you!)

The point here is that when you are dealing with cultivars and hybrids, you seldom know what the parents of the hybrid are or what their characteristics were. It's unlikely that the vendor who sold you the plant knows, and probably not even the wholesaler who grew the plant in greenhouses and shipped it to your local nursery. Although allelopathy can work through roots, stems or branches, it is most often exhibited in trees shedding their toxins on plants having the audacity to try to grow beneath them. It might kill freshly emerging seedlings, but you probably aren't trying to establish a viburnum forest anyway. 

So, your next question might be, what should replace the Artemesia? Appreciating your commitment to Texas native plants, return to the Native Plant Database. Select location (Texas), habit (grass or herb) and duration (perennial). The requirements for your site will probably be shade and dry for light and soil moisture. Using that information, Mr. Smarty Plants found 9 grasses and 43 herbaceous plants potentially suitable for your site. Good luck!

 

 

More Poisonous Plants Questions

Pool-Side Plants for Miami
April 02, 2015 - I am looking for plants, along the line of ti plant cordyline features, to plant around my chlorinated pool area with full South Miami sun. We have a dog therefore they must be non-toxic plants. The...
view the full question and answer

How to get rid of poison ivy (Toxicodendron radicans)
April 25, 2007 - Our school grounds are infested with lots of poison ivy. What is best remedy for extensive growth?
view the full question and answer

Plants toxic to horses in Travis County, Texas
September 20, 2012 - What plants/weeds are toxic for horses in Travis County?
view the full question and answer

Is it quantity that makes silver nightshade poisonous to people?
September 18, 2012 - I have a recipe for Asadero cheese that uses silverleaf nightshade and have eaten this cheese many times. Is it too much quantity that makes it poisonous to people?
view the full question and answer

Skin Reaction form Cochineal on Prickly Pear
February 16, 2015 - I have severe burning and peeling skin on pads of fingers after touching "white stuff" on a prickly pear. White stuff tuned purple then burned skin even after washing hands. Skin has been cracking a...
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