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
1 rating

Thursday - April 05, 2012

From: Phoenix, AZ
Region: Southwest
Topic: Diseases and Disorders, Trees
Title: Texas wild olive tree
Answered by: Ray Mathews

QUESTION:

I live in the Phoenix area. My Texas wild olive (Cordia boissieri) is about 5 years old, about 12 feet tall and has beautiful blossoms all year long. However, this past year (through all seasons) some of its leaves developed yellow/brown spots and other leaves are completely brown and falling off. I am not able to find much information on the diseases of this plant. Might this be a lack of N2? a mold? overwatering? ???? Any guidance you might be able to provide would be appreciated. Thank you.

ANSWER:

The wild olive tree Cordia boissieri (Mexican olive) is an evergreen native only to Texas in the U.S.,  but also to several states in northern and southern Mexico, including Coahuila, Nuevo Leon, San Luis Potosi, Tamaulipas, and Veracruz, per the following Agricultural Research Service, Germplasm Resources Information Network link. This rare small tree is reportedly ideal as an ornamental for confined areas. It is drought tolerant and insect and disease pests are generally of no concern. Birds and other wildlife feed on the fruit. It blooms in late May through early June.

However, since Cordia boissieri isn’t native in Arizona , it may be the wrong plant for Arizona. The symptoms you are observing may be due to mold or overwatering. We don't believe that nitrogen deficiency is the problem.

Bill Britt’s garden website offers the possibility of frost as an immediate cause, but the earlier browning does not follow the description for these symptoms?

We believe that you need someone who can look at the plant, and make an informed assessment. For that we suggest you contact the folks at the Maricopa County Office of Arizona Cooperative Extension for some help closer to home.

 

 

 



 

From the Image Gallery


Mexican olive
Cordia boissieri

More Trees Questions

Insect attack on bur oak (Quercus macrocarpa)
May 30, 2008 - Something is attacking the bur oak that was planted in 2007. Insects are not on the leaves, but the edges of some leaves look chewed back. Others look brown around the edges. Do you have any idea w...
view the full question and answer

Pecan tree dropping limbs in Grand Prairie, TX.
September 04, 2012 - Our 15 year old pecan tree is losing it's limbs. The tree and its leaves look healthy with no signs of bugs or mites, but all the limbs are drooping and breaking off. The tree did have a bumper crop ...
view the full question and answer

Difficulty of watering at drip line of trees from The Woodlands TX
August 18, 2011 - I'm watering my couple dozen native mature trees to make sure they survive this drought and its aftermath..and I'm reading about how to water at the drip line. But..all of my trees' drip lines ext...
view the full question and answer

Should I use wound paint when pruning my live oak tree?
February 04, 2010 - When trimming live oak branches, is it best to coat the wound on the tree? I have been doing this but have recently heard that it can actually be bad for the tree.
view the full question and answer

Looking for a specimen shade tree in San Rafael, CA
June 04, 2013 - I'm looking for a specimen shade tree that can get 30'x30', that doesn't drop a bunch of crud (seeds, etc) on the patio (leaves are ok), medium to low water requirement, roots are behaved, zone 9,...
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