Host an Event Volunteer Join Tickets

Support the plant database you love!

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 - November 06, 2014

From: Roswell, NM
Region: Southwest
Topic: Diseases and Disorders, Shrubs, Trees
Title: Texas Redbud Suddenly Died in NM
Answered by: Anne Van Nest

QUESTION:

We had a Texas redbud, approximately 5 1/2 years old. It had been doing great then all of a sudden after it bloomed this spring, the leaves appeared but then shriveled right away. We noticed the trunk had a very large split. We didn't have any high winds nor a cold winter. We are wondering if it was getting too much water? Trying to figure out why it died. It was east facing, in a small area surround by Vinca minor/ivy that gets watered with the lawn on an irrigation system. Any suggestions on a replacement tree? Purple leaf plum.

ANSWER:

So sorry that your Texas redbud (Cercis canadensis var. texensis) didn’t make it.  The Native Plant Database on the Lady Bird Johnson Wildflower Center says the following about the Texas redbuds. The redbuds of eastern North America have long been popular for their pink-purple early spring flowers that appear on bare wood before the leaves emerge. Texas redbud is the appropriate variety to use if you live on limestone soils from southern Oklahoma through central Texas to northeastern Mexico. It is drought-tolerant within its range, prefers dappled shade but is also found in full sun, and can do well even on relatively thin soils. Its glossy, rounded leaves bring welcome shade and its flowers attract pollinators.

Texas redbuds do like well-drained, calcareous, rocky, sandy, loamy, or clay soils, usually limestone-based. It is drought- and cold-tolerant within its range. Give it dappled shade when young. A selection called Sanderson is said to be the most drought-adapted Texas redbud cultivar.

The USDA Forest Service does include a few challenges for Texas redbuds on their website.

They note the following: the bark is thin and easily damaged from mechanical impact; susceptible to breakage either at the crotch due to poor collar formation, or the wood itself is weak and tends to break; susceptible to verticillium wilt.

Texas redbud should be grown in full sun or partial shade on moist, well-drained soil. It is highly drought tolerant once established and grows well in all areas within its hardiness range.

Canker is the biggest problem with Redbud. The fungus enters through wounds or dead and dying branches. Dieback begins as a canker on a branch. The cankers, at first small and sunken, enlarge to girdle the branch. Bark in the canker turns black and a crack forms between diseased and healthy bark. Once girdled, the part of the stem beyond the canker wilts and dies. There is no chemical control. Prune out diseased branches.

Leaf spots can be a problem during wet weather. Since the disease is rarely serious, no chemical controls are suggested.

Verticillium wilt attacks and kills Redbud. Fertilize affected trees and prune out wilted branches.

 

The Missouri Botanical Garden has a good article on verticillium wilt on their website which says that verticillium wilt is a fungal disease of over 300 host plants, including a wide range of garden and greenhouse crops in addition to woody ornamentals, most noticeably elms, magnolias, maples, redbud, and viburnums.  

Verticillium wilt is a fungal disease of over 300 host plants, including a wide range of garden and greenhouse crops in addition to woody ornamentals, most noticeably elms, magnolias, maples, redbud, and viburnums. (See following list for a more complete list of susceptible plants.) Caused by the soil-borne pathogens Verticillium dahliae and V. albo-atrum, these wilts are prevalent throughout the tropical and temperate regions of the world. They exist in the soil primarily as mycelia that infect belowground plant tissue. High summer temperatures tend to halt development of the disease. Groups of plants resistant to verticillium wilt include gymnosperms, monocots, members of the rose family, oaks, dogwoods, willows, rhododendrons, azaleas and others.

Symptoms of verticillium wilt vary somewhat in different host species and also within species due to varying environmental conditions. These might include sudden wilting of small branches, yellowing of foliage, stunting of growth and premature defoliation. Sapwood of infected branches typically has olive-green to black streaks. Vascular tissue appears as a dark ring in cross sections or pin-point dark spots. The initial symptoms may occur on only one branch or may involve the entire plant. Oddly, following the initial symptoms, there may be no sign of the disease for several years, even though the infection continues to reduce plant vigor.

Verticillium species are opportunistic fungi that persist in the soil as saprophytes. Infection begins in the root area where the resting hyphae of Verticillium germinate and penetrate feeder roots. The fungus also can enter wounds in the root area. The disease spreads within the plant by mycelium or spores called microconidea that travel in xylem vessels to other parts of the plant.  Water flow is restricted and the plant wilts. The entire plant may die quickly or may die section by section over many years.

The recommendation is to plant verticillium wilt resistant or tolerant species. There is a list of susceptible plants to avoid as well as resistant or immune ones on the Missouri Botanical Garden website.  Purpleleaf plum (Prunus sp.) is not recommended if verticillium wilt has been an issue in the past.

 

 

 

From the Image Gallery


Texas redbud
Cercis canadensis var. texensis

Texas redbud
Cercis canadensis var. texensis

More Shrubs Questions

Watering trees and shrubs in Buda TX
August 08, 2009 - Should we be watering our green ash, red tips, chinkapin, burr oaks and yaupon shrubs during the drought? They are all starting to brown and drop leaves. THANKS!
view the full question and answer

Reducing the Height of a Redbud Tree
January 23, 2016 - We have a very large, about 15-year old, Redbud tree that is growing so tall it's obstructing our view of the river. How and when can we prune this tree back so it does not hurt the tree.
view the full question and answer

Dwarf Yaupon Holly Cultivar Heights
September 18, 2014 - What is the largest of the dwarf yaupons?
view the full question and answer

Plant identification of thorny shrub in Tennessee
October 03, 2013 - I have a mid to dark green thorny type bush growing on my land in Cosby, Tennessee. I am originaly from NJ and I have never seen it before. The stalk is varigated and the thorns are plentiful and very...
view the full question and answer

Planting under Pine Trees in Pocatello ID
April 08, 2014 - Hi I was wondering if you could give me some ideas of what I could plant under and near some pine trees for my area. The trees are huge and so it is also constant shade where I want to plant. Thanks f...
view the full question and answer

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