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
2 ratings

Wednesday - December 10, 2008

From: Dallas, TX
Region: Southwest
Topic: Shade Tolerant
Title: Grass to grow in the shade of pecan tree
Answered by: Nan Hampton

QUESTION:

Dear Mr. Smarty Pants, We have an enormous pecan tree in our backyard that had grass underneath the breadth of the branches, but not around the trunk. The grass isn't doing well (though we did fail to fertilize it last year) and I was wondering if there is a grass that can grow under the shady limbs of a pecan tree. Will the shade and juglones kill anything and everything off? Thanks so much!

ANSWER:

You are correct that the juglones that are produced by trees in the Family Juglandaceae (Walnut Family) are allelopathic to some, but not all, other plants. You can see lists of plants susceptible to juglones and those tolerant of juglones from Ohio State Univeristy.  It appears that the level of  juglone in Carya illinoinensis (pecan) is less than in walnuts.  Grasses, in general, seem to be tolerant of juglones.  In fact, there have been studies showing that bermudagrass and tall fescue are allelopathic to pecan seedlings!

Here are three grasses and a sedge that occur in the Dallas area and will grow in the shade.  I have personal experience with inland sea oats growing quite happily under my walnut tree and suspect the other three species will also be tolerant of your pecan's juglones.

Chasmanthium latifolium (Inland sea oats)

Elymus canadensis (Canada wildrye)

Muhlenbergia schreberi (nimblewill)

Carex blanda (eastern woodland sedge)


Chasmanthium latifolium

Elymus canadensis

Muhlenbergia schreberi

Carex blanda

 

 

 




 

More Shade Tolerant Questions

Flowering shrub for part shade in Southern California
September 10, 2009 - What shrubs would be able to flourish in morning shade but deal with afternoon sun and 90 plus degrees in the summer months in Southern California? I would like a shrub that is about 5 ft. tall and 3 ...
view the full question and answer

Deer Resistant part shade plants for Austin:
March 28, 2010 - What evergreen shrubs would you recommend for a partly-shaded area, next to a wall, which can be trimmed to keep their shape and height (for symmetry)..this is for a front gate to a community, so we n...
view the full question and answer

Privacy shrub in part shade to shade in Austin
April 29, 2010 - Barbara Medford's July 1, 2008 reply regarding Little Emperor Japanese Blueberry Tree is exactly my experience with cherry laurel in partial sun/shaded area in Austin, Texas. For 6 - 8' height si...
view the full question and answer

Evergreen plants for shaded bed and removing bermuda grass.
November 29, 2007 - Hi, Mr. Smarty Plants, I have two questions. First, the back of our house in Williamson County faces north. We have plant beds (about one foot wide and the length of the house) up against the back w...
view the full question and answer

Ground cover for shaded sandy soil in Long Island, NY
May 12, 2009 - I live on the north fork of Long Island (Zone 7) I would like to find a grass or low ground cover that will grow in shaded sandy soil. The yard has quite a few trees. It also has to stand up to modera...
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