En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Should black-eyed susan (Rudbeckia hirta) plants be cut back

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

Wednesday - May 02, 2007

From: Robbinsville, NJ
Region: Northeast
Topic: Pruning, Herbs/Forbs
Title: Should black-eyed susan (Rudbeckia hirta) plants be cut back
Answered by: Nan Hampton and Joe Marcus

QUESTION:

I have black-eyed susan plants that were beautiful last year and flowered for a long time. Do they need to be cut back and if so, how much?

ANSWER:

It isn't really necessary to cut back Rudbeckia hirta (blackeyed Susan); but if you will deadhead them (i.e., remove the fading flowers before they set seed), it will prolong their flowering period.

 


Rudbeckia hirta

 

 

More Herbs/Forbs Questions

Red poppies to bloom in November from Round Rock TX
June 08, 2014 - Hi, I want to plant poppy seed so that they bloom in November for Veterans and Remembrance Day. Can you offer any guidance? Thanks!
view the full question and answer

Flowering native perennials for St. Louis
August 09, 2007 - Dear Mr. Smarty Plants, I'm trying to landscape a yard that sits on rocky clay soil in St. Louis, MO. The front yard has been difficult because of its brutal southern exposure - the afternoon sun ...
view the full question and answer

Use of non-native pothos for outside wall from Las Vegas NV
January 05, 2014 - I am in Las Vegas, NV. I live in a cottage-style apartment so I have a north facing porch with no one on the west so I get some there (and have an inherited cactus probably a yard all round) I would ...
view the full question and answer

Is Bushy Knotweed carcinogenic from West Grove PA
September 06, 2012 - Is the invasive Bushy Knotweed / PORA3 / Polygonum ramosissimum toxic to the extent that the spores are carcinogenic?
view the full question and answer

Pruning for Spring
January 21, 2007 - When should I cut back (and how far should I cut back) the following plants in order to promote growth in the spring: Salvia gregii, Salvia leucantha, Ruellia (Mexican petunia), Plumbago, Sku...
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