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 - June 25, 2012

From: Austin, TX
Region: Southwest
Topic: Invasive Plants, Non-Natives, Plant Identification, Vines
Title: Distinguishing non-native Wisteria from Austin
Answered by: Barbara Medford

QUESTION:

How do I distinguish a native wisteria from a non-native wisteria?

ANSWER:

About the best we can do is direct you to our Native Plant Database webpage on Wisteria frutescens (American wisteria). which is native to North America and East Texas. Even though it doesn't grow naturally in Central Texas, it is growing on some of the trellises in the Homeowner's Garden at the Lady Bird Johnson Wildflower Center. From our Image Gallery, below are some pictures of the native plant.

From our webpage, here are the distinguishing characteristics of the native:

"Shiny, dark-green, pinnately compound leaves bear 9-15 leaflets which are opposite on the leaf stem, with 1 leaflet at the tip. The flowers are in large, drooping clusters 6–9 inches long that appear after the plant has leafed out, a difference from the popular Asian species."

Next, we'll try to find some similar characteristics to compare from the non-native wisterias:

University of Connecticut Wisteria floribunda

  • odd, pinnately compound leaves
  • leaves contain 13 to 19 leaflets
  • leaflets are 10" to 15" long
  • leaf arrangement is alternate
  • young leaves are silky pubescent
  • leaf color is bright green
  • emerging leaves may be red-tinged

Invasives.org Wisteria sinensis

"Chinese wisteria is a deciduous woody vine capable of growing to a height of 40 ft. (12.2 m). Stems can be up to 10 in. (25.4 cm) in diameter with smooth, gray-brown bark. Alternate, pinnately compound (7-13 leaflets) leaves are tapered at the tip with wavy edges. Leaflets are approximately 3 in. (7.6 cm) in length. Lavender, purple or white flowers are fragrant, very showy and abundant and occur in long, dangling clusters in the spring. Seeds are contained in flattened, hairy, 6 in. (15.2 cm) long, bean-like pods. Invasions often occur around previous plantings. Chinese wisteria can displace native vegetation and kill trees and shrubs by girdling them. The vine has the ability to change the structure of a forest by killing trees and altering the light availability to the forest floor. A native of China, it was first introduced into the United States in 1816 for ornamental purposes."

Bottom Line: Buy only plants that are native, with the name Wisteria frutescens (American wisteria) on them.

 

From the Image Gallery


American wisteria
Wisteria frutescens

American wisteria
Wisteria frutescens

American wisteria
Wisteria frutescens

More Non-Natives Questions

Information on non-native Erythrinia crista-galli
April 30, 2008 - I am trying to find out some more information on a plant called firemen caps.. How to grow and sun or shade or both..
view the full question and answer

Planting conditions for non-native Oriental poppy in Colorado
May 14, 2009 - I live in Broomfield, CO. Is this a good time to plant oriental poppies, what is the best sun exposure and how should I prepare the soil?
view the full question and answer

Deadheading cannas and geraniums
August 17, 2007 - I'm new to gardening. Your help would be appreciated. 1) I think I read that canna flowers can be deadheaded so they will continue to bloom throughout the summer. What part is actually taken off? ...
view the full question and answer

Care of non-native, hybrid petunias
August 31, 2004 - I have a beautiful Petunia Tiny Tunia Violet plant which has been flowering nicely (in sun and shade environment). Suddenly, a few days ago, it began to look like it's dying--stalks all dried out. Is...
view the full question and answer

Plant ID of invasive vine from Austin
August 21, 2013 - A friend lives in southwest Austin and has a vine that's coming up all over her yard. I am a Williamson County Master Gardener and have asked all the garden gurus in my group what it is from a photo ...
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 | SITEMAP | STAFF
© 2016 Lady Bird Johnson Wildflower Center