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
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

Vine for shaded area in Austin
February 15, 2009 - Hi! I live in South Austin, and love my backyard. It is enclosed by chain-link fencing, and shrouded by (ack!) Hackberry trees. I would like to plant a vine on one fence to provide a privacy screen. T...
view the full question and answer

North-central Texas shrubs for part-shade
March 30, 2011 - I need a shrub that will be OK in shade (2-3 hrs a day max.), in fairly well-drained soil, will grow to around 8 ft. tall and 4-6 wide, for the region between Denton and Gainesville. If it flowers, al...
view the full question and answer

Shade plants for a childrens garden in Magnolia, TX
June 21, 2009 - What shade plants would be good to plant in a Children's garden at a learning center?
view the full question and answer

Erosion Control for a Shaded Slope in Aliquippa PA
May 07, 2014 - What plants. shrubs or trees can I plant to retard soil erosion on a steep shaded hillside in PA
view the full question and answer

Need help with stabilizing a partial shaded slope in Prince George's County, MD.
September 08, 2009 - I have a partial shade sloped area about 40 ft. x 100ft; that is at the top of a natural drainage. Slope is maybe 10%. There is a thin layer of topsoil on top of a heavier clay layer (it was pasture...
view the full question and answer

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