En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Weak stems on asters and ironweed from Woodbridge ON

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

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


Giant ironweed
Vernonia gigantea

Missouri ironweed
Vernonia missurica

Smooth blue aster
Symphyotrichum laeve var. laeve

More Herbs/Forbs Questions

Failure to come up of blackeyed susans in Lancaster PA
June 28, 2009 - My blackeyed susans have been blooming for ten years. All of a sudden this year they didn't come up at all..why?
view the full question and answer

Native perennials for Missouri City, TX
March 19, 2014 - I checked all the questions for my area and still need help. What are some native perennials for southeast Texas
view the full question and answer

Soil for native Chilopsis linearis and Salvia greggii
February 08, 2010 - I want to plant a desert willow and a salvia greggii in my small lot. The developer used sandy loam to fill in the small garden in the front. I am 73 and a bit impaired. Do I really need to remove ...
view the full question and answer

Curb appeal for sale of house
December 16, 2007 - Help! We're selling our house soon and need to redo our flowerbeds in the front of the house (facing north, gets partial sunlight throughout the day) in the coming weeks but don't have a clue where...
view the full question and answer

Lupines annual or perennial in Zone 4b from Austin
November 08, 2012 - Are lupines treated as perennials or annuals in Zone 4b (Northeast) if they are planted in the ground? Will other native species of lupines grow in a region they are not native to? Any recommendations...
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