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
Not Yet Rated

Friday - June 29, 2012

From: Prosper, TX
Region: Southwest
Topic: Non-Natives, Pests
Title: Application of sprays to non-native Crape Myrtle from Prosper TX
Answered by: Barbara Medford

QUESTION:

Can applying a systemic insecticide/fungicide combo prevent or limit Crape Myrtle blooms? I have 5 large lavender Crapes that are not blooming or budding yet and this is the first time I have used a systemic on them. Applied it in late May. They do have new growth and are very full.

ANSWER:

 

Lagerstroemia indica (crape myrtle) is native to China, Japan and Korea and is therefore out of the realm of expertise of the Lady Bird Johnson Wildflower Center, home of Mr. Smarty Plants. We are committed to the growth, protection and propagation of plants native not only to North America but to the area in which those grow natively. This is a conservation issue, because plants native to an area will have become accustomed to the soils, rainfall and climate over centuries of experience.

From the United States National Arboretum, here are Questions and Answers on Crape Myrtle. From that article:

"My crapemyrtle is reluctant to bloom. What am I doing wrong?

Crapemyrtles flower most heavily in full, uninterrupted sunlight.  Even an hour of shade during the day will compromise flowering.  Frequent irrigation, lack of heat, and overfertilization promote vegetative growth at the expense of flowering.  In extreme drought conditions or cool, rainy summers, flowering may be delayed until the early autumn."

We also discourage spraying any kind of "...icide" to a plant without clear indications that it is needed.

 

 

 

More Pests Questions

Problems with purple passion flower from DeKalb TX
March 27, 2011 - Yes my purple passion plant, is pretty but there is a piece of it that's all limp, what do I need to do to revive it?
view the full question and answer

White ash trees with bunched up leaves from Nevada TX
June 09, 2012 - I have very young white ash trees (3' tall planted this winter) The leaves are crippled not opening up bunched up together and have a white powder. Is this aphids mites or what. Only on one tree. Th...
view the full question and answer

Insects on non-native euonymus in Lake Orion MI
June 23, 2010 - I had a greenlane euonymus that had a few flies last year but was infested with thousands this year. We ripped it out, it was an 8 year old plant. Do you know why they are attracted to it now?
view the full question and answer

How are NPIN Deer Resistance Ratings Determined?
May 06, 2014 - If your plant data-base (which is the best thing since sliced bread!) is silent on the degree to which a plant is deer-resistant, does this mean you just don't have enough information to make the cal...
view the full question and answer

Problem with leaf cutting bees in Houston, TX
December 08, 2014 - I have four Arapaho crepe myrtle trees in my backyard and two have leaves, especially the young leaves, being eaten by something. I do not see ants of beetles on the leaves and have not seen any bees ...
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 | STAFF
© 2015 Lady Bird Johnson Wildflower Center