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
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

Erosion Solution for Lorton, VA
February 07, 2014 - We have a steep slope in our common area of our homeowners association. Trees that were planted have died. It is a large area around a pond. What should we plant that will hold the soil? The soil...
view the full question and answer

Distance from existing oak trees to place paving
December 16, 2008 - We are designing an expansion for an existing veterinary office and the desired side for expansion will require addition to the parking and drive aisle to the back side of the property. My question i...
view the full question and answer

Spots on bark of Mountain Ash from Engadine MI
April 30, 2012 - I have a mountain ash that is about 5 years old & have just noticed white, patchy, scaly looking spots on the bark. Is this something to be concerned about???
view the full question and answer

Transplanting aspens and Colorado blue spruce trees
August 18, 2009 - Please help me with info on transplanting aspen and blue spruce trees in Colorado. I live at 8600ft and have tons of deer. thx
view the full question and answer

White pine insect problems
October 08, 2009 - We live in The Woodlands TX. Some of our large pine trees have leaking sap and one is dead. What can we do to save the one's still alive?
view the full question and answer

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