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
Not Yet Rated

Friday - December 02, 2011

From: Tucson, AZ
Region: Southwest
Topic: Diseases and Disorders, Trees
Title: Failure to thrive of Tex-ash in Tucson AZ
Answered by: Barbara Medford

QUESTION:

I planted a mature (15') Tex-Ash about a year ago. Lately more and more leaves seem to be browning and it has never filled out. I am concerned I am going to lose it if I don't get it something before Winter. Luckily I live in Arizona, but there will be a few freezing days here. Can you help diagnose the problem?

ANSWER:

First, rhetorical question. When was "about a year ago"? If it was during the summer of 2010, although not as hot as the summer of 2011, your tree may be suffering from transplant shock. In the South and Southwest, we always recommend that woody plants (shrubs and trees) be planted in the cold weather of December to February. The trees are dormant then, and damage to roots or trunk is not quite as dangerous, plus you will not be asking a  plant to draw up enough water and nutrient through its tiny fragile new rootlets to survive.

Second, we need to establish exactly what tree you have. Fraxinus texensis (Texas ash) is a possibility, but on the page about this tree in our Native Plant Database, we find this statement:

"Confined to Texas, except for a northern extension into the Arbuckle Mountains of Oklahoma. This southwestern relative of White Ash (Fraxinus americana) has fewer and smaller leaflets and smaller fruit and is adapted to a warmer, less humid climate; some consider it a variety of that species." So, we think it's a little unlikely that is what you have.

Then, there is the Fantex Ash. This does not appear in our database, because it is a cultivar and therefore not considered native. However, here is a previous Mr. Smarty Plants answer concerning that tree with more information about it.

Next possibility, Fraxinus velutina (Arizona ash). You can follow any of the plant links to learn more about each tree in our database. Please note this comment on the Arizona Ash:

"Conditions Comments: F. velutina is an extremely variable species. F. velutina var. coriacea grows in CA; F. velutina var. glabra grows in TX. All varieties are fast-growing and relatively short-lived."

From another previous Mr. Smarty Plants answer:

"Some characteristics that are common to members of the Fraxinus genus are that they are fast-growing and short-lived. They need a lot of water and fertilizer. One horticulturist has actually labeled them "trash trees" because of their short lives, demanding requirements and dropping of seed pods and leaves.

Ezine articles Arizona Ash Trees - "Arizona ash trees, like many other plants, are susceptible to various pests and diseases. These include cankering, mildews and various fungal infections, leaf scorch, rust diseases, and pests such as mites, webworms, carpenter worms, and borers. Ash trees are particularly vulnerable to Verticillium wilt, which is a soil-borne fungus. In some parts of the country (primarily the midwest), the emerald ash borer has killed many tens of thousands of ash trees. Luckily, Arizona ash tree varieties have not yet been affected by the destructive emerald ash borer. Trees that endure poor environmental conditions are more vulnerable to these problems, so it is important to keep the tree's defenses up by watering and fertilizing adequately.

Purdue University Verticillium Wilt of Shade Trees

USDA Animal and Plant Health Inspection Service Emerald Ash Borer

University of Illinois Extension Ash Tree Problems

Again, since we only have information on the native Fraxinus velutina (velvet ash) and not on the results of grafting which produces the cultivar Fantex, we can't say for sure what might be going on. According to this USDA Plant Profile Map,  the Arizona Ash is native to Pima County in south-central Arizona,  the climate would seem appropriate, but we noticed several referrals to ash trees needing lots of water. You might also get some local information on problems others in your area are having with ash trees by contacting the University of Arizona Cooperative Extension Office for Pima County.

 

 

 

 

 

From the Image Gallery


Texas ash
Fraxinus albicans

Arizona ash
Fraxinus velutina

More Trees Questions

Native plants of Taos and Los Alamos NM from Houston
April 07, 2012 - Hi, Mr. Smarty Plants, can you recommend a guidebook for the native plants of the Taos/Los Alamos region? (I'm most interested in forbs.) I'll be headed there in May--is there anything I should es...
view the full question and answer

Controlling a shrub/tree with lots of thorns and flowers similar to beebrush, but lots of thorns
July 08, 2014 - I live in Horseshoe Bay, Llano County with 1.5 acres of natural habitat. There is a plant that I have always called Cat's Claw but in researching Cat's Claw, I may have misidentified it. It has a fl...
view the full question and answer

Bugs on Arizona Cypress in Bellwood IL
August 27, 2011 - I live in Illinois and have an Arizona Cypress that looks like it is dying but I notice today it has bugs inside its cone. Can you tell me why and what can I do?
view the full question and answer

Looking for fruit and nut trees to plant in San Augustine, TX
April 05, 2011 - I am setting up residence in San Augustine, Texas on approximately 9 acres of land. We wanted to plant a few of each type of fruit and nut trees that would prosper in the area (for wildlife and for o...
view the full question and answer

Webbing on oak leaves and fuzzy yellow growths on leaf veins
November 09, 2010 - I have a large red oak(?) and live oak that appear to have the same problem. Clumps of leaves all over the trees are covered by fine webbing and the leaves appear to be curling up and dying in the we...
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center