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
3 ratings

Tuesday - July 05, 2011

From: Nashville, TN
Region: Southeast
Topic: Diseases and Disorders, Pests, Herbs/Forbs, Wildflowers
Title: Petals not developing on blackeyed susans from Nashville TN
Answered by: Barbara Medford

QUESTION:

I have an established "patch" of black eyes susans. This year, the leaves are beautiful, the centers black..but the petals are practically non existent. They didn't seem to develop correctly. Any idea what's up?

ANSWER:

Rudbeckia hirta var. pulcherrima (Blackeyed susan) appears on this USDA Plant Profile map to be native in or near Davidson Co., and you say your patch is established, so the soils should not be the problem. This plant is pollinated by bees and flies but also attracts butterflies, and is a larval host for the Silvery Checkerspot.

Do the petals look like they have been chewed at all, or are they stunted or misshapen? Take a look at this page of images of Blackeyed Susan from our Native Plant Image Gallery. There seems to be quite a variety of leaf types and colorations, but no closeups, at least, of flowers with stunted petals. If you find any caterpillars, they could be the culprit, and are probably the larvae of the butterfly mentioned above.

If you have eliminated all those problems from consideration, we can only fall back on the weather. Here in Texas, we are in such an extreme heat wave and drought that flowers bloom, set seed and go into near dormancy, just to survive. The Blackeyed Susan is a biennial or can be a short-lived perennial. This plant does not need to be fertilized, but it does like some moisture. Our best bet is that it is adapting itself to adverse conditions, but continuing to set seed (the black center), and hold on until the weather gets a little easier on plants and people.

 

More Pests Questions

Insects attacking Gregg's Blue Mistflower from Comfort TX
June 20, 2013 - I have a beautiful stand of Gregg's Blue Mist flower that have been attacked by an unknown insect. The new growth is curled and stunted and it is not flowering. I'm not alone..I've seen the Gregg'...
view the full question and answer

Controlling scale insects on hollies
July 10, 2005 - I have a number of holly shrubs at the side of my house. Recently I noticed that they have tiny white spots on them. I looked at several native Texas gardening books, but can't find what I need to t...
view the full question and answer

Landscaping for slope in Kansas City
October 08, 2008 - We have a down sloping back yard and patio on the lower area. We need some water absorbing plants near the foundation and some in the front of the house, where water isn't a problem. We are allergic ...
view the full question and answer

Texas Ash secreting sap in Lockhart, TX
July 05, 2012 - I have what I believe is a Texas Ash in my front yard that is secreting a sap with what looks like some wounds on it with some white stuff and with black and red looking ants as well as it has a lot o...
view the full question and answer

Removing bermudagrass from buffalograss in Smithville TX
May 01, 2013 - I have a lawn created two years ago with buffalo grass sod in Smithville, TX. Recently several areas of bermudagrass have started to flourish in the buffalo grass lawn. Can you recommend a herbicide...
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