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
Not Yet Rated

Thursday - December 04, 2008

From: Kirkwood, MO
Region: Midwest
Topic: Wildflowers
Title: Preparation of site for wildflowers in Missouri
Answered by: Barbara Medford

QUESTION:

I have 1/2 lb of wildflower seed I would like to plant in the next couple days. the directions say to rid site of all weeds, do you have a suggestion of how to rid my site of thistle? Sow and canadian. We are supposed to have temps in 50s mid week. Also sites where I have grass I am putting down cardboard and covering with thin layer of topsoil, can i throw seeds on top of top soil? thanks.

ANSWER:

You certainly chose the right time of year to plant wildflowers in your part of the world; unfortunately, the other issues you mentioned about removing weeds, especially thistles, are going to take about a year to bring about. If you have already sowed the seeds, hopefully they were not too expensive and you can consider it an experiment. 

To begin, we want to suggest you read a couple of our How-To Articles: Meadow Gardening  and A Guide to Native Plant Landscaping.  In the second article, pay particular attention to the section on "Soil Preparation" as it addresses your questions about pre-planting work that needs to be done. 

Next, let's talk about the seeds. If you purchased them locally or ordered them from a supplier that provides seeds specific to an area, that's good. Unfortunately, there are a lot of offers for a "wildflower wonderland" that are composed of seeds that are no longer viable, not native to where they will be planted, and possibly will produce undesirable plants that turn out to be invasive weeds where you live. There are probably seed suppliers in your area that sell the kind of seeds you need, but if not, you might try some online suppliers, like Wildseed Farms. This links you to a page where you can select your part of the country, select mixes, with the names of the plants included, and order online. It is important to plant wildflowers (or any other plant) that are native to your area, as they will already be adapted to your climate and conditions, and will need less water, fertilizer and maintenance. In response to your question about putting down cardboard with a thin layer of soil, and throwing seeds on top; again, this is a matter of experiment. If the wildflower seeds can sprout there, so can weed seeds, but it's worth a try.

Now, on to your more specific questions about ridding your site of thistles.  In our Native Plant Database, we found Malacothrix sonchoides (sowthistle desertdandelion). If you follow that plant link, you will find our page on it, with some pictures; however, when we checked on that in the USDA Plant Profile, it did not show that particular plant growing in Missouri.  There are so many common names for every plant, we thought we'd look a little further and see if we could find the specific plants you are dealing with.

Sow thistle: This website on Sonchus arvensis from the Minnesota Department of Natural Resources probably refers to the plant you have.  It points out that this is a perennial, and that it can reproduce both by seed and vegetatively, which means that a new plant can re-grow from just a little piece of root. Talk about double whammy! They make suggestions for getting rid of it, but the bottom line is it needs to be pulled out as soon as it sprouts, and/or cut down before it goes to seed. The problem is that the seeds can lie in the soil for years and resprout, and birds, wind and animals will bring more seeds from now on. Be patient, just keep pulling it out. And remember, get root and all, because it can resprout from a leftover root piece.

Canadian thistle: Who knows how this plant got its name? It is not a North American native, but an invasive weed native to Europe and Asia. From Oregon State University, we found this site on Cirsium arvense, which indicates that it is, under state weed control laws in at least 16 states including Missouri, a noxious weed. Some controls are suggested, including plowing the area several times a season and some chemical controls. The Lady Bird Johnson Wildflower Center recommends neither for nor against the use of herbicides, but urges that any application be done carefully and according to instructions on the product. 

Now, on the bright side, let us suggest some wildflowers native to Missouri that you should be able to enjoy, after you have rid your area of the villains. We are going to go to our Recommended Species section, click on Missouri on the map, and NARROW YOUR SEARCH by specifying "herbs" (herbaceous plants) under the dropdown menu for Habit. You can do the same thing, specifying also the amount of sunlight available, soil moisture, even color and time of bloom. If you would like to have some local sources, go to our Native Plant Suppliers site, type your town and state in the "Enter Search Location" box and you will get a list of native plant nurseries, seed suppliers and landscape consultants in your general area.

Asclepias tuberosa (butterfly milkweed) - perennial, sun to part shade, blooms orange, yellow May to September

Baptisia alba (white wild indigo) - perennial, part shade, blooms white June and July

Campanulastrum americanum (American bellflower) - annual, part shade, blooms blue, purple June to August

Coreopsis lanceolata (lanceleaf tickseed) - perennial, sun to shade, blooms yellow April to June

Echinacea purpurea (eastern purple coneflower) - perennial, sun to part shade, blooms purple April to September

Geranium maculatum (spotted geranium) -perennial, sun to part shade, pink, April to July

Lobelia siphilitica (great blue lobelia) - perennial, sun to shade, blooms blue July to October

Monarda fistulosa (wild bergamot) - perennial, sun, part shade, blooms white, pink, purple May to September

Penstemon digitalis (talus slope penstemon) - perennial, sun to shade, blooms white June and July

Ratibida columnifera (upright prairie coneflower) - perennial, sun, blooms orange, yellow, brown from May to October

Symphyotrichum ericoides (white heath aster) - perennial, sun to part shade, blooms white, pink, yellow, blue August to October

Viola pedata (birdfoot violet) - perennial, sun to shade, blooms blue, purple March to June


Asclepias tuberosa

Baptisia alba

Campanulastrum americanum

Coreopsis lanceolata

Echinacea purpurea

Geranium maculatum

Lobelia siphilitica

Monarda fistulosa

Penstemon digitalis

Ratibida columnifera

Symphyotrichum ericoides

Viola pedata

 

 

 

 

 

 

More Wildflowers Questions

Native flowers for color year round
May 02, 2007 - I have the opportunity to recommend plants for a religious organization. They want YEAR ROUND color in some areas, much like how commercial sites use annual color. I would like to suggest native/ada...
view the full question and answer

Propagation of California poppies in Abilene, TX
September 25, 2008 - I live in Abilene,TX and would like to plant some California Poppies from seed. Is it best to sow these in the fall or wait until the spring? Our winters can produce some cold spells of below 20 degre...
view the full question and answer

More on bluebonnets
April 19, 2007 - Are pink bluebonnets still considered very rare? I discovered several growing amongst normal blues on the National Instruments corporate campus here in Austin. I wasn't sure if the Wildflower Cente...
view the full question and answer

Growing Texas Bluebonnets in Colorado
February 12, 2009 - I bought bluebonnet seeds from your wildflower center last August when visited Austin. Being a Texas native, I want to enjoy bluebonnets here in Colorado. When do I plant my seeds outdoors? In the gro...
view the full question and answer

More on bluebonnets
May 17, 2006 - I'd like to know if Texas Bluebonnets or even Aggiebonnets (maroon bluebonnets) can be grown in the Phoenix, AZ area. If so, what conditions would you recommend doing this in, as our spring and summe...
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