Contact Us Host an Event Volunteer Join

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

Saturday - October 06, 2007

From: Austin, TX
Region: Southwest
Topic: Diseases and Disorders, Herbs/Forbs
Title: Lantanas failing to bloom, turning brown
Answered by: Barbara Medford

QUESTION:

The lantana in my front yard does not bloom, is not overwatered but does get watered, leaves turned brown and plants generally have not grown. The lantana in the rest of the yard are in bloom and look great. I'm wondering what potential disease they might have. These plants have bloomed in the past but not the way they should. Any advice?

ANSWER:

Lantana urticoides (West Indian shrubverbena) and Lantana camara (lantana) are the native forms that are most likely to be growing in this area. However, it is more likely that what you have in your garden is a commercially named cultivar, hybridized for bloom type or color. Hybridizing will often change the basic nature of the plant to the extent that it no longer has some of the qualities of the true native, such as resistance to disease or adaptability to poor soils. That is why we at the Lady Bird Johnson Wildflower Center urge the use of native plants in our landscaping.

However, we can tell you some of the problems that lantanas can encounter, and perhaps one of them will answer your question. Poor blooming in the lantana is usually due to too much shade or excessive fertilization. You live in the Austin area and have experienced the same cool, wet two months of the summer as we have, but if your other lantanas are blooming all right, the weather probably isn't the problem. If, however, this particular plant is too shaded by a building or other plants, that could cause a number of different problems. Powdery mildew often occurs on lantanas grown in too much shade. If the plant is in an area poorly drained or watered too frequently it can develop root rot. Excessive fertilization may reduce flowering and make plants more susceptible to disease.

Now, how about varmints? Lantana lace bugs can cause leaves to appear stippled or to brown and drop. Sooty mold, causing a blackish discoloration on the leaves, is usually caused by an infestation of whiteflies.

If it turns out the location, shade, drainage, etc. are the causes of your plant's woes, it probably should be removed. It wouldn't be advisable to transplant it to some other location where mildew or insects might move to healthy plants. If you want to try to give it another chance where it is, and if there is enough sun there, remember that during the bloom period the lantana needs a thorough watering once a week if it hasn't rained an inch or so that week. Try to avoid watering from overhead, as with a sprinkler, as this can also contribute to the mold problems. You might also try trimming it back as much as a third; water and fertilize the newly cut back plant and, hopefully, it will return to bloom quickly.

 


Lantana urticoides

Lantana camara

 

 

More Diseases and Disorders Questions

Leaf problems on Cherry Laurel in Boulder City, NV
January 29, 2011 - I live in Boulder City, Nevada and have 4 cherry laurel trees. I'm having a hard time with brown leaves and loss of leaves. How much water should I give them each season? Temps run from 28 degrees to...
view the full question and answer

Problems with wax myrtle in Roanoke, VA
August 20, 2009 - Our Wax Myrtle bushes tend to lose all their foliage during the Winter months and each year seem to flesh out their leaves less with each passing Spring. One bush never returned and save for one branc...
view the full question and answer

What about the brown dots on my Silver sage?
June 27, 2008 - During the past year, the leaves on my silver sage bushes around the perimeter of the front of my house have turned yellow in places and there are tiny brown dots on virtually all of the leaves. If I ...
view the full question and answer

Problems with October Glory maple tree in Evansville IN
June 10, 2010 - We have a 15 yr. old October Glory maple tree. 2 years ago we had a bad ice storm and this tree was covered with 1/2 to 3/4 " of ice. The tree resembled a chicken wishbone with its limbs touching ...
view the full question and answer

Splitting bark on non-native mimosa from Buda TX
June 24, 2012 - What would cause my Mimosa tree to have splitting bark. I've only lived in this house for 8 months and am learning about this tree. The other tree seems fine. It looks as though it split and then ...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.