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
Not Yet Rated

Thursday - August 08, 2013

From: Birdeye, AR
Region: Southeast
Topic: Propagation, Seeds and Seeding, Herbs/Forbs
Title: Cold stratification of Rudbeckcia maxima from Birdeye AR
Answered by: Barbara Medford

QUESTION:

How long do I cold stratify Rudbeckia maxima seeds that I wild harvested? Can I put them in the freezer instead of fridge? Do I need to make sure they are completely dry before cold strat?

ANSWER:

There are 20 members of the Rudbeckia genus native to North America, of which 11 are native to Arkansas. However, this USDA Plant Profile Map shows that Rudbeckia maxima (Giant coneflower) is only native to 3 counties on the western edge of Arkansas, clear across the state from Cross County, so you may have harvested seeds from a very similar species or even from a hybrid. However, it really doesn't matter too much, they are closely related enough that if we can find propagation instructions they should be applicable to any of the Rudbeckia species.

Our webpage on R. maxima did not have propagation instructions on it, but the page on R. hirta, also native to Arkansas, had these instructions:

"Propagation

Propagation Material: Seeds
Description: Propagates very easily from seed sown in fall or spring. Spring-sown seed should be stratified. Rake seed into a loose topsoil or cover with ¼ to ½ inch of soil or mulch. If possible, supplement with water if fall or spring rains are infrequent and light. The seed requires several days of moisture and should germinate in one to two weeks.
Seed Collection: The nutlets turn charcoal-gray at maturity, usually 3-4 weeks after the bloom period. Seeds are mature at this time, but they are easier to collect after cones lose their tight compact stucture. Store dry in sealed, refrigerated containers.
Seed Treatment: Stratify for 3 months at 40 degrees.
Commercially Avail: yes
Maintenance: Black-eyed Susans are drought tolerant but respond well to an occasional watering. Additional irrigation in a dry year will improve the density of the stand and lengthen the flowering season. Do not mow until after the plants have formed mature seed cones, about three to four weeks after flowering. (Check by breaking a cone open and if the seeds are dark, they are mature.) The number of volunteer plants can be limited by removing the seed heads after the flowers are done."

Since this member of the Mr. Smarty Plants Team has no personal experience with cold stratification of seeds, we found these instructions from Wildones.org. Hopefully, you will find the method that works best for you.

 

From the Image Gallery


Giant coneflower
Rudbeckia maxima

Giant coneflower
Rudbeckia maxima

Giant coneflower
Rudbeckia maxima

More Propagation Questions

Propagation of Arisaema dracontium
May 25, 2008 - We are fortunate enough to own an 8-acre drainage next to Bull Creek preserve, and it has several stands of Green Dragon (Arisaema Dracontium) growing in it. How can we propagate this plant and share...
view the full question and answer

Will Hesperaloe parviflora Yellow propagate true from seed?
May 11, 2009 - Mr. Smarty Plants, I have searched all over the internet and have not been able to find an answer to my question. Will Hesperaloe parviflora 'Yellow' propagate true from seed or is division requ...
view the full question and answer

Transplanting bluebonnets in late Fall from Georgetown TX
November 08, 2013 - Transplanting bluebonnets in October? Neighbor wants to share abundance of rosettes and good size plants- any suggestions or warnings? Will freeze/frost protection be needed if we get December freeze...
view the full question and answer

Student wants pointers to increase germination rate of Salvia farinacea in Lubbock, Texas
October 06, 2010 - I am a student at Texas Tech, studying environmental horticulture. I have been doing research on Salvia farinacea as well as a number of other natives. I've just been assigned a project to increase t...
view the full question and answer

Grooming and propagation of Bee Balm
August 28, 2007 - I planted our first Bee Balm [Mornarda didyma] bush a month ago. I`ve watered it daily and it is growing well with many runners apparent. Should I be deheading or pinching regularly? Should I cut it ...
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