En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Nutrient imbalance in Tecoma stans

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
1 rating

Thursday - October 18, 2007

From: San Angelo, TX
Region: Southwest
Topic: Diseases and Disorders, Shrubs
Title: Nutrient imbalance in Tecoma stans
Answered by: Jimmy Mills

QUESTION:

I have two Tecoma stans on the north-east side of my yard. They have grown very tall (5') but have not bloomed all summer. Last summer they bloomed profusely. Any idea what the problem might be?

ANSWER:

Tecoma stans (yellow trumpetbush) aka Esperanza or Yellow Bells is a popular landscape plant that is native to Texas and Northern Mexico, and the cultivar "Gold Star", developed by a plant breeder in San Antonio, TX, has become a favorite in Texas due to its abundant flower production and its shorter height.

Since you had profuse blooms last summer, but none this summer, the question to ask yourself is what am I doing differently this summer? Flowering is a complex process that is influenced by several factors including amount of sunlight, amount of water, and nutrient balance, particularly the nitrogen to phosphorous (N/P) ratio. Unless you have transplanted the Tecoma or have had an unusual amount of rainfall, you can probably eliminate the first two. Austin has had a really wet summer, and the Tecoma here are blooming spectacularly.
That leaves nutrient levels. If you fertilized in the spring with a fertilizer that had higher nitrogen content relative to phosphorous, this may be your problem. I'm including links to Texas A&M and Penn State that do a great job of explaining the N/P ratio and its effect on flowering.

You might also check to make sure that there aren't any insects that are attacking the immature buds. 

 

From the Image Gallery


Yellow bells
Tecoma stans

More Diseases and Disorders Questions

Improving blooming on mock orange
March 03, 2008 - I have a now 6 yr. old mock orange shrub in the garden which has never bloomed, darn it. I have fed, not fed, mulched, not mulched, sheared, not sheared. What gives? Will it ever bloom, or shall I ...
view the full question and answer

White fuzz on Christmas tree from Lewisburg PA
January 04, 2011 - Our Canaan fir Christmas tree is now coated with white fuzz after being up for 4 weeks. The fuzz looks like spider webs, but it is also in clumps around the needles. When you rub your finger on it, ...
view the full question and answer

Chlorotic disease in scrub oak from Katy TX
July 04, 2013 - Please tell me how to treat my scrub oak as it has chlorotic disease. Parts of the tree are fine and others have yellow leaves. It has not been injured in any way.
view the full question and answer

Sticky sap (honeydew) on car
July 10, 2012 - MY CAR IS CONSTANTLY COVERED WITH STICKY SAP. I LIVE IN AN AREA WITH MANY COCONUT PALMS AND OTHER TREES. COULD THE SAP BLOW AROUND EVEN THOUGH I KEEP CHANGING THE PARKING?
view the full question and answer

Problems with giant coneflower in Richardson TX
June 05, 2010 - Dear Mr Smarty Plants- I have had a giant coneflower in my garden for 2 years now. This year it came up like it always had..got lots of leaves and then withered..turned brown and died. It got plent...
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