Native Plants
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.
Did you know you can access the Native Plant Information Network with your web-enabled smartphone?
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.
rate this answer
Tuesday - May 01, 2012
From: West Lake Hills, TX
Region: Southwest
Topic: Invasive Plants, Non-Natives, Plant Identification, Problem Plants
Title: How Can I Tell an Invasive Thistle from a Native
Answered by: Mike Tomme
QUESTION:
Mr Smarty Plants, I have some thistles coming up in my yard. I'd like to keep them if they are native, but not if they are invasive or non-native. How can I tell? My yard is a wild area in West Lake Hills, TX.ANSWER:
It would seem you have asked a simple question, but in reality you haven't. As you can see from this previous Mr. Smarty Plants answer, there are quite a few different plants that occur in central Texas that can be called some sort of thistle. As this answer makes clear, it can be difficult to tell the natives and non-natives apart and it requires a fair amount of research.
To help simplify mattes, I am going to assume that the thistles in your yard are the ones with the pink/lavender flowers that are blooming all around central Texas at this time of year. If you have the ones with yellow or white flowers, go back to that previous answer.
In her book Wildflowers of Texas, Geyata Ajilvsgi includes two thistles with pink/lavender flowers which I take to mean they are among the most common. They are:
Cirsium texanum (Texas thistle) - As you would guess from its name, this is a native thistle
Carduus nutans (nodding thistle) - This is a non-native. It is listed as an invasive plant by both Texasinvasives.org and the USDA. Another common name for it is musk thistle.
These are very similar in appearance. I sought help with identification methods from Minette Marr at the lady Bird Johnson Wildflower Center and she suggested a article published by the Oklahoma Cooperative Extension Service at Oklahoma State University entitled Thistles in Oklahoma and Their Identification.
From the Image Gallery
More Plant Identification Questions
State flower of Hawaii
January 04, 2006 - What color is the state flower of Hawaii?
view the full question and answer
Locating Rhododendron calendulaceum
April 26, 2008 - Trying to locate Rhododendron calendulaceum
view the full question and answer
Plant identification of 3-leaf plant with red berries in Utah
July 27, 2011 - I would like to send you a picture to ID a 3 leaf plant with red berries. Could you give me an email to do that? Thanks.
view the full question and answer
Mystery dill-type weed
September 01, 2008 - My daughter has a weed growing in her flower bed that look very simular to dill weed, but thicker. If you pinch it, it has a sticky milky substance come out. Can you tell me what this plant may be?
...
view the full question and answer
Will Butterfly Plant Survive in Mansfield, Texas
January 06, 2012 - I have a butterfly plant that was very successful (about 4 feet tall) right up until the cold snap three weeks ago. I've read they have a tap root, so I'm hoping it will come back next spring. Mea...
view the full question and answer
| Support the Wildflower Center by Donating Online or Becoming a Member today. |