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?


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

Monday - April 04, 2011

From: Austin, TX
Region: Southwest
Topic: Diseases and Disorders
Title: Chlorotic leaves on yaupon in Austin
Answered by: Barbara Medford


My yaupon holly looks chlorotic, it is 7 years old, I do not feed it, just a little seaweed occasionally. I am a totally organic gardener.


We looked up "chlorosis" in Botany for Gardeners by Brian Capon (see Bibliography below) and learned that "the characteristic deficiency sympton of magnesium and iron is chlorosis (yellowing of the leaves) due to the curtailment of chlorophyll synthesis. Magnesium is an integral element in chlorophyll molecules; iron must be present during production of the pigment."

From the University of Illinois Extension, this article Focus on Plant Problems has  very good information on the reasons for cholorosis. You need to read the whole article, as it has suggestions for treatment, but we felt the first paragraph probably summarized what you need to be looking for:

"Chlorosis is a yellowing of leaf tissue due to a lack of chlorophyll. Possible causes of chlorosis include poor drainage, damaged roots, compacted roots, high alkalinity, and nutrient deficiencies in the plant. Nutrient deficiencies may occur because there is an insufficient amount in the soil or because the nutrients are unavailable due to a high pH (alkaline soil). Or the nutrients may not be absorbed due to injured roots or poor root growth."


More Diseases and Disorders Questions

Problems with volunteer tree in Joshua TX
February 15, 2012 - I have a 'volunteer' tree which has been in our back yard for about 15 years. It has had the usual traumas, ie. lots of snow, ice, etc. but after last years drought, its bark is coming off and sev...
view the full question and answer

Yellowing leaves on weeping willow
August 03, 2008 - We have a 4 year old Weeping Willow, 12+/- ft. tall and this week the leaves are starting to become yellow. This willow is full and robust in appearance, best it's ever looked. We have 2 other Wee...
view the full question and answer

Demise of Flameleaf Sumac in Austin, TX.
July 31, 2012 - My Flameleaf Sumac suddenly died. Beetles came out around the trunk when I cut it down. How can I prevent this on the other sumac?
view the full question and answer

Yellowing of fronds on Sago Palm
March 27, 2007 - Our Sago Palm now has all yellow fronds from the Winter frosts. Should they be cut off? Will the plant grow new fronds from the bottom to replace the ugly looking ones that are there? And why do I se...
view the full question and answer

Use of surfactants with herbicide for water
January 05, 2008 - I read the article on frogs and the use of Rodeo. Your answer was correct, but to the best of my knowledge, Rodeo is approved for use near water only because it lacks a surfactant. When surfactant...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
© 2016 Lady Bird Johnson Wildflower Center