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
3 ratings

Thursday - October 23, 2008

From: Great Neck , NY
Region: Northeast
Topic: Container Gardens, Water Gardens, Herbs/Forbs
Title: Overwintering a Juncus effusus in Great Neck, NY
Answered by: Barbara Medford

QUESTION:

Can I over winter a juncus effusus spiralis indoors or must it be kept outdoors? Whether indoors or outdoors, what is the proper way to keep it alive during the winter months?

ANSWER:

Juncus effusus (common rush) is native to New York and is hardy from USDA Zones 4 to 10. It appears that Great Neck, New York is in Zones 6b to 7a, so the plant should certainly survive outside. Juncus effusus 'Spiralis' is a selection for horticultural use, low growing with strongly spiraling stems. According to this Floridata article on Juncus effusus, it is really better to allow the plant to freeze back, remaining outdoors during the winter, because the stems (there are no leaves) will come back much stronger and better-looking. In milder climates (such as indoors) the stems will get brown and less attractive-looking, and will need to be trimmed. However, this page from Blue Stem Nursery on Lesser Corkscrew Rush refers to it as a plant that can be kept in a terra cotta pot and double as a winter houseplant. We would imagine the soil in the pot would need to be kept pretty moist, but we did see a number of illustrations of the plant in pots and indoors. 

Pictures of Juncus effusus 'Spiralis'

 

More Herbs/Forbs Questions

Trimming of penstemon after bloooming from Austin
April 30, 2012 - I planted a penstemon in my backyard last fall and it's doing great. Once the flowers have bloomed, do I cut the stalk back? It is about 2 ft tall and doesn't appear to be doing anything. I belie...
view the full question and answer

Small, flowering, evergreen plants for hillside in Austin.
October 27, 2007 - I have a steep, dry hillside measuring approximately 4 feet high by six feet wide. I want to plant low growing, evergreen, flowering plants across the bed that will flower as long as possible, and thr...
view the full question and answer

Starting Yarrow (Achillea) and Daucus from Seed
July 16, 2014 - I need to deadhead my cottage yarrow. I assume it has gone to seed. What do I do to plant it as seed? If I can do it, can I do it now or do I need to wait until spring. If I need to wait until spring,...
view the full question and answer

Technique of using cut flowers to make paper
October 18, 2006 - Have an inquiry regarding how to locate (or if such a craft/technique exists) someone or some service that is aware of a process to take fresh-cut flowers & dry & press them into paper or onto paper t...
view the full question and answer

Mildew on phlox paniculata from Morrisville PA
May 30, 2014 - My Phlox paniculata, all 7, have powdery mildew. I read about using NEEM to combat the mildew. NEEM is organic but the bottle says it is also an insecticide. The phlox are near my milkweed and gold...
view the full question and answer

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