En EspaŅol

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
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.
 
rate this answer
1 rating

Tuesday - June 19, 2012

From: Black Earth, WI
Region: Midwest
Topic: Invasive Plants, Plant Identification
Title: Identification of yellow flowers in Wisconsin
Answered by: Nan Hampton

QUESTION:

We have plants near Madison, Wisconsin that some call lanceleaf coreoposis however I believe they are some type of invasive species. They have yellow flowers, seem to spread by seed. and don't grown in bunches but are individual plants. They put out plenty of seed. They re-bloom if dead headed. Can you tell me if there are plants that are not lanceleaf coreoposis but have blooms that are similar? If invasive I want to eliminate them as soon as possible.

ANSWER:

Coreopsis lanceolata (Lanceleaf coreopsis) grow in small clumps and are perennials.  The flowers themselves are on single stalks.  They will grow from seed.  Here is more information from Illinois Wildflowers and from Floridata.  You will see from the Floridata page that deadheading encourages more blooms on these plants.  They are often planted for roadside beautification projects.

There are other species of Coreopsis that grow in or near Dane County, Wisconsin:

Coreopsis grandiflora (Largeflower tickseed) is a perennial that self-sows and can become weedy.  The blossom look a lot like C. lanceolata, but is usually taller with different shaped leaves.  Here is more information from Illinois Wildflowers that gives you the differences between this plant and Coreopsis lanceolata.

Coreopsis palmata (Stiff tickseed) has ray flower petals that are more rounded on the end.   Here is more information from Illinois Wildflowers and from Michigan Natural Features Inventory.  It is considered a threatened species in Michigan.

Coreopsis tinctoria (Plains coreopsis) has maroon or red coloring around the central disk.

Coreopsis tripteris (Tall coreopsis) has round petal tips and brownish disk flowers.

Here is a list of invasive species from the Invasive Plants Association of Wisconsin (IPAW).  The IPAW defines an invasive plant as one that:  "both invades native plant communities and impacts those native communitities by displacing or replacing native vegetation."  None of the plants I could see on the lists look like a Coreopsis species.  The IPAW also has a Weedy and aggressive plant species native to Wisconsin list.  Their definition of a weedy plant is:  "A plant that establishes and invades only in seriously disturbed areas (especially in disturbed ground)."  From that list there is one native plant, Helenium autumnale (Common sneezeweed), that somewhat resembles C. lanceolata.  You might also like to check with the Wisconsin Botanical Club (dedicated to the native flora of Wisconsin) to see if they have any information about invasive plants of the Family Asteraceae (Aster Family) similar to Coreopsis lanceolata that have been found in your area.

Probably what you are seeing is either C. lanceolata or C. grandiflora, either of which are plants native to your area.  Even though they are native, they may be weedy or invasive according to your thinking.  If that is so, since neither of these is an endangered or threatened species, you could remove them if you wish.

 

From the Image Gallery


Lanceleaf coreopsis
Coreopsis lanceolata

Lanceleaf coreopsis
Coreopsis lanceolata

Largeflower tickseed
Coreopsis grandiflora

Largeflower tickseed
Coreopsis grandiflora

Stiff tickseed
Coreopsis palmata

Plains coreopsis
Coreopsis tinctoria

Common sneezeweed
Helenium autumnale

More Invasive Plants Questions

Smarty Plants on native plants
March 26, 2004 - What is a native species?
view the full question and answer

Non-native, and/or invasive bermudagrass, St. Augustine and Pistache from Houston
September 24, 2012 - Our St. Augustine lawn died suddenly this summer from either chinch bugs or grub worms (or both?), and a multitude of weeds and native Bermuda have taken over the area. Now that the weather has cooled...
view the full question and answer

Dietes bicolor invasive from Brisbane Australia
April 01, 2013 - We have dietes bicolor growing in our garden. I am changing the type of garden and cannot seem to kill it. I've dugged it out, spent too many weekends pulling out every new shoot, used poison, but t...
view the full question and answer

When to plant non-native red-tip photinia
November 17, 2011 - When do you plant the Red-Tip Photinia Flowering Shrubs in Roanoke VA?
view the full question and answer

Invasive spreading weed in Michigan that looks like a small pine tree
July 29, 2013 - I have an invasive spreading weed in my gardens. It has black root system, comes up looking like a small pine tree. The green breaks off when you try to pull it.
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center