Rent Shop Volunteer Join

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

Please forgive us, but Mr. Smarty Plants has been overwhelmed by a flood of mail and must take a break for awhile to catch up. We hope to be accepting new questions again soon. Thank you!

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

Plants that will grow on the Connecticut coast
June 08, 2010 - I live on the coast in Connecticut and have a hard time growing plants here. I live about 1/2 mile from the beach and find that my soil is very rocky. The only plants that have done well in my yard ...
view the full question and answer

Identity of a yellow-flowered wildflower with prickly burs
May 20, 2013 - Hi there. We have seen a wildflower, probably invasive, that is at least in Travis, Williamson, and Hays counties. We have tried to identify it without success, The structure of the plant is remark...
view the full question and answer

Need tips for planting wildflower seeds in pots in Edinburg, TX.
July 22, 2012 - Can you give me some tips for starting wildflower seeds in pots or trays, rather than outdoors? Is this even possible? Most instructions I have found are for seeding large areas. I want to get some p...
view the full question and answer

Effects of Hedysarum mackenzii from Pflugerville TX
May 08, 2013 - What are the effects of Hedysarum mackenzii?
view the full question and answer

Drought-Tolerant Plants for Arizona
July 16, 2015 - Slowly turning south-facing lawn to drought-tolerant plantings with gravel paths. Mature Ponderosa and several blue spruce and junipers surround area. Grass area I'm converting with a few larger tr...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.