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
1 rating

Wednesday - August 06, 2008

From: Bandera, TX
Region: Southwest
Topic: Non-Natives, Diseases and Disorders, Pests, Shrubs
Title: Failure to thrive of Lantanas
Answered by: Barbara Medford

QUESTION:

Here at work we have 4 beautiful yellow Santanas(should I say had), the leaves have started to turn brown and no longer blooming. Appears to have a fungus or disease. Please help!

ANSWER:

Okay, well, we really thought the Santanas were more interesting. But we'll have a go at identifying what's wrong with your Lantana. Mr. Smarty Plants will tackle any question, whether it's the one you asked or not. Nearly any question. As we told you in our last answer (on the wrong plant) the Lady Bird Johnson Wildflower Center recommends the use of plants native to North America and to the area in which they are being grown. The native lantana we sell at the semi-annual Plant Sales at the Wildflower Center is Lantana urticoides (West Indian shrubverbena). These are red, yellow and orange, sometimes referred to as "calico plant". Most of the plants sold in commercial nurseries are hybrids and non-natives to North America. Some of them can become quite invasive and are regarded as such in places like Florida. However, invasiveness obviously is not your problem, so let's see if we can figure out what is happening to your plants.

Your yellow lantana is probably Lantana camara, cultivar "New Gold." One of the problems with researching the lantana is that most sites are for invasive plants. Even this site, from Arizona Wild Flowers, Gold Lantana, refers to it as one of the 100 most invasive plants in the world. However, one of the pests that are said to infest lantana is the whitefly. It tends to be more of a problem in enclosed areas, being grown as a house plant, or greenhouses. If you bought the lantanas recently, it's barely possible that is the problem, as the infestation may have come with the plant in immature form. The referenced website has some suggestions for identifying and eliminating them. There is always the possibility of aphids attacking your plants; they tend to be more prevalent when a plant is stressed by drought, which goodness know we have had this summer in Texas. And, finally, spider mites may be present. Each of these websites gives some chemical and biological controls suggested for the specific insect. Please read them all the way through and compare with any bugs you can find on your plant. We will also give you some websites with pictures of each beastie. Don't use any controls until you know exactly what you are dealing with. For instance, insecticides will not harm spider mites, but will kill predators of the spider mites, thus increasing the number of spider mites that are actually feeding on the plant.

Pictures of spider mites

Pictures of aphids

Pictures of whiteflies

Now, if you examine all of these and you still don't think you've found the cause, we recommend you just try a bandaid, and see if that's what it takes. Trim off the "diseased" or dead branches, but leave as many green leaves for nutrition as possible. If this means taking a lot of the crown off, go ahead; if the lantana recovers, it will grow back more vigorously than before. Then, give it a little more tender loving care. Even though it is considered drought resistant, if the plants were purchased and planted fairly recently, they may not have developed a very good root system before they were put out for sale. Large commercial nurseries will often "force" blooming to increase sales appeal, and the roots may not yet be able to take care of the plant's needs, once it gets into the ground. Don't fertilize it, over-fertilizing is one of the things that attracts aphids. Put some shredded hardwood bark over the roots for cooling and retaining moisture, and give the plants some regular deep drinks of water. As tough and well-adapted as this plant normally is, we feel it will rise and bloom again, maybe not this summer, but surely next spring.

 

 

More Diseases and Disorders Questions

Prickly pear doing poorly on Long Island NY
December 27, 2012 - First, thanks for your reply on 11-3-12, re.Can a prickly pear cutting from Harker Heights, TX find happiness in Long Island, NY. The plants were set before a southern window in the attic, temp. ra...
view the full question and answer

Growth on trunk of Eastern Redbud
November 14, 2007 - My seven yr. old Eastern Redbud has a large patch (12x4inches) of white grey, shell or mushroom-like growth on the trunk. The bark has a wide split so the growth is on the layer of wood inside the sp...
view the full question and answer

Burning sulfur over coals in the home for insect control.
July 18, 2008 - Is burning sulfur(over hot coals) in your home a safe way of getting rid of ants and insects?
view the full question and answer

Older leaves yellowing on Savannah holly in Dallas
May 01, 2009 - I planted a Savannah Holly in Dallas, TX in the Fall of 2008. It has new growth and some white buds all over it, but some of the older leaves are turning yellow and dropping off. Is this normal?
view the full question and answer

Mexican Lime Turning Yellow
March 25, 2015 - What causes moderate yellowing of 40% of the leaves of an 8 year old Mexican Lime Tree that is booming and blooming right now with lots of thick new growth? I used a general garden fertilizer a few ...
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