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
17 ratings

Sunday - September 14, 2008

From: San Antonio, TX
Region: Southwest
Topic: Diseases and Disorders, Pruning, Trees
Title: Pruning mature cedar elm trees in San Antonio
Answered by: Barbara Medford

QUESTION:

When is the right time to prune my several mature cedar elm trees? I'm in San Antonio, and they have never been trimmed in the 55 years we have lived in this home. I have several that are at least 70 ft tall and they need cleaning up. I wouldn't want to harm them, though.

ANSWER:

Ulmus crassifolia (cedar elm) is a native North American deciduous tree which reach 50 to 90 feet in height with a spread of 40 to 60 feet. It would be a low maintenance shade and street tree except for its thin drooping branches which are somewhat susceptible to breakage at the crotches of major limbs. Some of this could be avoided by maintaining a regular pruning and training program in the early years after transplanting. For more information, see this USDA Forest Service website on Cedar Elm.Your elms have already had a pretty good life span, at 55+ years, and are at a height to be expected at their age. They have a fairly long life span, perhaps 150 to 300 years. So, at first glance, we could say your elms have been doing just fine, and need no trimming, etc.

However, the main drawback to the elm is Dutch elm disease. Dutch elm disease was first discovered in Ohio in 1930. Spores of the disease are carried on the bodies of elm bark beetles and are deposited in tree wounds. The beetles, perhaps introduced accidentally from Asia, attacked trees that had not had a chance to develop a resistance to the disease over time. It is caused by a fungus transmitted by two species of bark beetles.

Avoid pruning from April to August. The elm bark beetle is attracted to freshly cut elm and is most active during this period. Prune dead or dying branches from Fall to late Winter. We would urge you to engage a licensed arborist, for several reasons. They will be aware of the potential problems for the elm tree, and know when is the appropriate time for pruning. Also, they will have the equipment and expertise for dealing with such a large tree. Please don't climb up your trees with a chain saw. You will possibly damage a whole lot more than the tree.


Ulmus crassifolia

Ulmus crassifolia

Ulmus crassifolia

Ulmus crassifolia

 

 

More Pruning Questions

Non-blooming Texas Mountain Laurel
March 30, 2008 - Two questions: 1. My mountain laurel (10 yrs old) has never had blooms. Is this a gender plant issue? 2. I have been seeking a groundcover that grows in shade and will take foot (dog) traffic. ...
view the full question and answer

Center of Yucca filamentosa looking rotten in Howell, NJ
May 31, 2009 - I live in central NJ. I planted some Adam's Needle Yucca in my garden around 5 years ago. Since then, they kept growing and ended up developing three trunks off of the main trunk. I noticed recentl...
view the full question and answer

Tree removal from Austin
November 18, 2013 - Unfortunately we need to cut down a Spanish oak (11" diameter, over 50 feet tall) that is leaning against our upper story deck (if it falls, the roof, deck, and steel supports may be crushed). A lim...
view the full question and answer

Cutting back perennials from Austin
February 08, 2011 - When is it time to cut back native plants; salvia;copper canyon daisy; verbena, etc?
view the full question and answer

Spring care for Garrya ovata from Pflugerville, TX
February 24, 2014 - Hello again, Mr. S-P, I planted a Mexican silktassel in April 2012 (purchased at the WFC). It has done well, but the leaves are bronzed and splotchy from this winter's freezes. All the stems are...
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 | SITEMAP | STAFF
© 2016 Lady Bird Johnson Wildflower Center