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

Ground cover for Dallas in shade and partial shade
June 02, 2010 - What ground cover plants will grow in full shade- partial shade in the clay soil of Dallas?
view the full question and answer

Mulching in deep shade in Round Rock TX
June 22, 2010 - Central Texas: Problem is deep shade and high temps. I noted your advice about danger to the tree when planting beneath shade trees, but wonder if there is a substance - perhaps pine needles - that co...
view the full question and answer

Plant that can move from outside to inside for Denton, TX
December 14, 2008 - I am looking for a plant that is either native to Texas or is well acclimated to the Denton TX area that can move from a covered outside area to an adjacent indoor area behind large glass walls, to a ...
view the full question and answer

Plants for northern exposure in Wichita, KS
March 17, 2009 - What are good plants for the north side of the house with acidic soil in Zone 6, Wichita, KS?
view the full question and answer

Stumps of fallen oaks in Hurricane Irene from Newton PA
September 03, 2011 - Two large red oaks fell in the woods in our yard in Newtown PA due to Hurricane Irene. The trees have been removed, but the stumps remain. Please can you recommend some fast-growing, attractive, nativ...
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