En Español

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
Not Yet Rated

Friday - July 12, 2013

From: Chambersburg, PA
Region: Mid-Atlantic
Topic: Invasive Plants, Non-Natives, Trees
Title: Non-native Royal Empress tree with only green leaves from Chambersburg PA
Answered by: Barbara Medford

QUESTION:

I have 3 Royal Empress trees in my yard that are between 2-4 yrs old and have never been any color other then big Green leaves. Do you know when they will turn Purple?

ANSWER:

Please read this article from Ecosystem Gardening Native Alternatives to Invasive Paulownia Trees.

Paulownia tomentosa (Royal Empress) is a deciduous tree in the family Paulowniaceae, native to central and western China, but invasive in the USA. The Lady Bird Johnson Wildflower Center, home of Mr. Smarty Plants, is dedicated to the growth, propagation and protection of plants native not only to North America but to the area where those plants grow naturally; in your case, the borough of Chambersburg in South Central Pennsylvania. This places that tree out of our realm of expertise but we wanted to address your question in hopes it would discourage others from planting this non-native invasive tree.

From the Missouri Botanical Garden here is an article on Paulownia tomentosa, which said "No fall color." We found purple leaves mentioned nowhere else, although the flowers are purple.

 

More Non-Natives Questions

Low temperature non-native Bauhinia variegata can withstand in Florida
March 13, 2009 - I have a Bauhinia variegata,I reside in Florida. What is the temp it can withstand in winter? And if it is below freezing, what can be done to protect them from freezing?
view the full question and answer

How to Deal With Goutweed?
June 12, 2015 - Hi, I'm wondering what plants (groundcover) would best compete against goutweed. It's coming up all around some existing potentilla shrubs and some nice bulbs and prairie perennials. I would hate to...
view the full question and answer

Vegetables to plant now from Marble Falls TX
January 28, 2013 - What are the best vegetables to plant now?
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

Pruning a non-native Hinoki cypress from Denver NC
July 08, 2011 - Hi! Our painters have asked that we trim the Golden Hinoki Cypress back from the house. The tree is about 20' tall, beautiful and healthy. Since it is July and therefore, HOT! I'm wondering how t...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center