En Español

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

Saturday - October 20, 2012

From: Stockton, CA
Region: California
Topic: Non-Natives, Diseases and Disorders, Pests, Edible Plants, Trees
Title: Spots on non-native naval orange trees from Stockton CA
Answered by: Barbara Medford

QUESTION:

I have two mature Navel Orange trees. One tree has developed spotty chlorophyl depleted areas that were not on the oranges when they were smaller. In addition, the oranges on both trees are smaller , by half, than normal for this time of year. Tanglo and Lemon on both sides show no sign of this problem..It really looks like something is eating small areas of chlorophyl.

ANSWER:

Citrus x sinensis means it's not from around here, not even in California. Orange trees probably originated in Southeast Asia and were cultivated in China by 2500 BC. We always want to know where a plant is native, because that helps us know in what soils, rainfall and climate it grows well. The Lady Bird Johnson Wildflower Center, home of Mr. Smarty Plants, is dedicated to the growth, protection and propagation of plants native not only to North America but to areas where those plants grow naturally.

Even though we will have no information in our Native Plant Database on oranges, we will try to find some websites that might give you some clues:

University of Florida Extension Citrus Black Spot Symptoms in Brazil.

San Francisco Chronicle Citrus Fruit with Black Spots

To get information on a plant that is not necessarily native but does grow locally, we suggest you contact the University of California Cooperative Extension Office in San Joaquin County.

 

 

More Diseases and Disorders Questions

Problems with Ashe juniper from Lakeway TX
May 25, 2013 - Dear Sir/Madam, I have been living for the last three years in Lakeway, Texas approximately 20 miles west of Austin. In my back garden there are several ashe junipers about 15-20ft tall. However...
view the full question and answer

Problem with Habiturf. Is it dormant or dead?
July 24, 2013 - We planted habiturf in spring 2012. It's beautiful. But since last summer, we have had one area that seems to go dormant much more rapidly than the rest, even though it receives the same amount of ...
view the full question and answer

Failure to flourish of Trumpet Creeper in Leesburg VA
June 28, 2011 - Dear Mr. Smarty Plants: Late last year I planted a trumpet creeper vine to grow on my fence and attract hummingbirds. It gets full sun, is in average soil and gets adequate water. I put a few daylilli...
view the full question and answer

Saprophytic fungus on mulch
June 22, 2007 - I just did some major landscaping in my west Austin, TX backyard. I added many native plants and mulched all of the new beds. I did this just before the heavy rains in the past two weeks. I now not...
view the full question and answer

Repairing the split trunk of a TX mountain laurel
February 28, 2015 - I have a fairly large mountain laurel that I just realized has a split down the trunk. Is there anything I can do to save it?
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 | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center