En EspaÑol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Cold stratification of Rudbeckcia maxima from Birdeye AR

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 Seeds and Seeding Questions

Seeds for India from Guilderland NY
August 15, 2010 - I have Green Cross “Non Profitable” trust in TamilNadu India. We are looking for free seeds from Government and other NGO foundations. Moto: Global Vowing awareness program and our volunteers help ...
view the full question and answer

Wildflower seeds affected by mulch in Austin
October 24, 2010 - I have a small wildflower garden in my central Austin yard. In early summer, I had some extra mulch and put it in this garden. Now I'm thinking that was a mistake. The bed has re-seeded itself for se...
view the full question and answer

Dill-like plant in veggie garden in California
September 28, 2011 - I have a plant that appeared in my veggie garden. Looks like dill in spring when green, but the leaves smell more like turpentine! Now, 4-5 foot tall, brown, it produces lots of small, oval - not cr...
view the full question and answer

Collecting seeds of Anemone berlandieri, windflower
March 29, 2010 - The recent rainy weather has produced a small colony of what I have identified from your web site as Anemone berlandieri Pritzel (Texas Anemone) in my backyard. Is there a way to harvest these seeds f...
view the full question and answer

More on bluebonnets
May 09, 2003 - When can I harvest my Bluebonnets?
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