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
1 rating

Thursday - June 12, 2008

From: Nashua, NH
Region: Northeast
Topic: Non-Natives
Title: Failure of non-native mock orange to bloom
Answered by: Barbara Medford

QUESTION:

We have a mature mock orange shrub that is very healthy but has not bloomed at all. What can we do?

ANSWER:

Since this is a non-native of North America, we do not have the Philadelphus coronarius (mock orange) in our native plant database. Our emphasis at the Lady Bird Johnson Wildflower Center is the planting, propagation and protection of plants native to North America and, indeed, to the area in which they are growing. However, we are always interested in plants, and will try to find some answers to your question about this native of southern Europe.

This site from North Carolina State University on mock orange was about the best at presenting the facts on care and appropriate conditions for this plant. The USDA Plants Profile shows it growing all the way from Georgia in the South up into far northeast Canada, including New Hampshire, so you must be in the right zone for it. One interesting fact we picked up in our research is that non-blooming mock orange can be the result of too little sun or too much fertilizer. The flowering of any plant will be affected by the application of too much fertilizer, especially high nitrogen fertilizers. At bloom time (late Spring to early Summer) you might try a shot of high phosphorus plant food. High nitrogen encourages lush leaf growth, but not blooms. Mock orange apparently does best in rich soil, well-draining, that is slightly acidic to neutral. To encourage bloom, it should be pruned right after blooming, and oldest branches should be pruned right down to ground at the same time. But, if it hasn't bloomed at all, that makes it a little difficult to know when to prune.

If you feel your plant is getting enough sun, not too much fertilizer, and the roots are in well-draining soil, we would suggest you take it out and replace it with something else that better fills that space. We haven't seen it grow in Texas (way too much sun and heat, probably), but we understand it's not a particularly handsome shrub when it's not blooming, that not all mock oranges have any or much fragrance, and it doesn't bloom very long. Why waste your time, resources, and energy on that?

 

 

More Non-Natives Questions

Water for non-native Sub-Zero ivy in El Paso
March 25, 2011 - Sub-Zero Ivy: Do they require lots of water - I live El Paso, TX - dry climate. Are they dangerous to dogs? Will they do well as ground cover around a brick patio? - Thanks!
view the full question and answer

Non-native Genista racemosa from Houston
June 17, 2012 - Read your info on Genista Racemosa. Doesn't address my problem of it not blooming this year. It's in full sun and growing well, about 30" tall & round. Bloomed last year. We're feeding with ba...
view the full question and answer

Growing non-native aloe in Seguin TX
March 17, 2009 - I would love to grow aloe plants; both because I like the look of them and for their medicinal properties. Here in Texas people grow them both indoors and out. For some reason, I have not had any l...
view the full question and answer

Non-native Jacaranda interfering with concrete wall from Los Angeles
August 17, 2011 - We have been replanting the area surrounding our 2 story apt bldg and on one area, there is Jacaranda that started growing in an enclosed cement block wall area. The cemented walled in area which is ...
view the full question and answer

Non-native oleander failing to thrive in Corpus Christi
May 05, 2010 - I live in South Texas (Corpus Christi). My husband planted Red Oleander in partial to full sun about 1 1/2 weeks ago. They are watered by our sprinkler system. They have recently started to bloom, ...
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