Native Plants
![](../_images/smarty_plants.gif)
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 is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.
![](../_images/mr_smarty_plants_logo_web_200w.jpg)
rate this answer
![](../_images/star_00.gif)
Wednesday - June 06, 2012
From: Woodbridge, ON
Region: Canada
Topic: General Botany, Soils, Herbs/Forbs
Title: Weak stems on asters and ironweed from Woodbridge ON
Answered by: Barbara Medford
QUESTION:
My question is in regards to plants flopping over. My smooth asters and ironweeds never seem to have strong stems. Is because the soil is too fertile or maybe too shallow?ANSWER:
You may be eligible for the "I stumped Mr. Smarty Plants award!" We found an answer but it was talking about marigolds, but we think it's possible the same answer may be true for your plants. Read this article from eHow Why do Flowers on Marigolds Bend? From that article:
"Overhead watering may cause stem breakage and bending if blossoms become saturated; always water at the base of the plants.
Marigolds are heliotropic, meaning their flowers and leaves turn toward the sunlight whether the plants are grown indoors or out. Cells near the base of the blossoms control the bending, by shrinking or enlarging to move the flowers toward the light source. By keeping marigolds in full sunlight all day, you'll help avoid this survival mechanism and keep flowers from possibly bending away from main focal areas of the garden."
There are four species of the gender Vernonia (ironweed) native to Ontario: Vernonia fasciculata (Prairie ironweed), Vernonia gigantea (Giant ironweed), Vernonia missurica (Missouri ironweed) and Vernonia noveboracensis (New york ironweed). Symphyotrichum laeve var. laeve (Smooth blue aster) is also native to Ontario. You can follow each plant link to our webpage on that plant to see if you get any clues of what you might be doing wrong in terms of soil or watering of those plants. We did some extra research on heliotropism, which obviously occurs in many plants.
We checked all of these ourselves and concluded that all could do well in moist, fertile soils and full sun. About the only possibility that presents itself to us, since we cannot see the plants, is the caution against overhead watering, which can weigh down large heads of flowers, thus bending the stem.
From the Image Gallery
More Herbs/Forbs Questions
Growing butterfly weed as a girl scout project
July 30, 2012 - We have a group of girl scouts who want to sell 'crafts' at a farmers market. I am wanting to steer the moms and girls in a different direction. I was wondering if you think that butterfly weed woul...
view the full question and answer
Eliminating ragweed in Sacramento CA
May 16, 2012 - Rag weed. How to be rid of it! My wife and lots of others that live in this part of Sacramento suffer greatly.
view the full question and answer
Iris Changing Color?
April 03, 2015 - I have some iris planted under a very tall tree and they bloom nicely every February. The original bulbs were given to me when I moved here to Arizona 30 years ago. They have always bloomed white. I h...
view the full question and answer
Is Canna glauca invasive?
June 10, 2015 - How aggressive is Canna glauca? I'm interested in planting one near a gutter downspout, but I'm afraid it will crowd out groundcovers (heartleaf skullcap and fall obedient plant) in the two location...
view the full question and answer
Propagation of Chandler's craglily from San Marcos TX
December 16, 2012 - Can you please advise me on collecting and propagating seed from Chandler’s craglily -Echeandia chandleri. I have 2 plants that came from the wildflower center. They never seem to multiply, but they d...
view the full question and answer
Support the Wildflower Center by Donating Online or Becoming a Member today. |