En Español

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
Not Yet Rated

Thursday - January 22, 2009

From: Flower Mound, TX
Region: Southwest
Topic: Trees
Title: Brown circular ring in trimmed branches of redbud tree
Answered by: Nan Hampton

QUESTION:

I have a redbud tree that was recently trimed back. When looking at the cross section of the branches, I noticed a brown circular ring. Is this a problem and if so what can I do to correct it?

ANSWER:

The dark ring you see is possibly the heartwood beginning to form in the branches of your Cercis canadensis (eastern redbud).  If you could see a cross section of the trunk of your tree, you would see that the center of it is a reddish-brown color, the inactive heartwood; whereas, the wood surrounding it, the sapwood, which actively transports water and nutrients (the sap), is yellowish tan.  You can read a good discussion on the difference between sapwood and heartwood at Northern Woodlands.org.  Twigs and younger branches contain only sapwood; but as the branches grow in diameter, the lighter sapwood is transformed into the darker heartwood towards the center of the branch.  The heartwood provides structural support.  So, it is possible that the forming heartwood is the dark ring you see in your cut branches.  Click here to see the wood of several species of Cercis.

You can read about a variety of damaging agents to the redbud and it is possible that your dark ring is an indication of some fungal disease or insect damage. If your redbud shows other symptoms (e.g., fungal growths on the trunk) that give you concern, it would be a good idea to consult your Denton County Texas AgriLife Extension Service agent and/or a certified arborist who can look at your tree and diagnosis the problem and possible ways to treat it.


Cercis canadensis

Cercis canadensis
 

More Trees Questions

Growing Magnolia trees in Palm Desert, CA.
October 02, 2012 - Will magnolia trees grow in the Palm Desert/Indio, CA area?
view the full question and answer

Need trees & shrubs for a 2.5x45 ft. planter box in Chatsworth. CA.
August 07, 2012 - We recently built a pool in our backyard and need to redo all the landscaping. We have a planter that is 45 feet long and about 2.5 feet wide. We'd like to put some trees in this planter that are n...
view the full question and answer

Failure to thrive of desert willow in Wimberley TX
August 10, 2010 - I have a desert willow. It is always, whether I water it or leave it alone, yellow/ brown leaves, dark spots on the leaves, losing leaves. now it looks sad and not very healthy. Can you please tell m...
view the full question and answer

Is the Ashe juniper native from Round Mountain TX
June 23, 2010 - Some friends and I disagree on something, and I hope you will settle the argument. Are the cedars found in the Texas hill country (ashe juniper) native or not?
view the full question and answer

Pruning Roughleaf dogwood
November 28, 2013 - We put 5 rough-leaf dogwoods along our side deck; having been told (by the local, natural plant seller) that they would reach a maximum height of 6 feet. They have grown taller than that (despite som...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center