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 Non-Natives Questions

Pruning of overgrown non-native boxwood from Round Rock TX
February 19, 2011 - We have several large over-grown Japanese Boxwoods that we'd really like to trim down in height about 10 to 12 inches, however most of the middle and lower sections of the bushes are bare or very spa...
view the full question and answer

Dying non-native red tip photinias in Lexington NC
June 27, 2009 - Large Red Tip bushes, what can I do to keep them alive? I have a few and they are dying. What can I do to save them?
view the full question and answer

Thinning of non-native rosemary
May 09, 2007 - I live in NW Austin and have a very large rosemary bush that is having problems this season. We trimmed the bush in early March because the plant was getting too large for the space. It is roughly 3...
view the full question and answer

Getting flowers to grow under non-native globe willow in Salt Lake City
June 12, 2010 - We have a globe willow in our back yard that is about 15 years old and cannot get any flowers to grow under it. Can you recommend what we need to do to treat the soil, and what type of flowers will gr...
view the full question and answer

Growing pecan and fruit trees near Canyon Lake, Texas
July 07, 2014 - I just bought a property on the north side of Canyon Lake in the Hill Country of Texas. Most of the trees around are cedar, and a few live oak. I know I have seen beautiful Pecan trees as well as seve...
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
© 2014 Lady Bird Johnson Wildflower Center