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?


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

Thursday - May 01, 2008

From: Sault Ste Marie, MI
Region: Midwest
Topic: Poisonous Plants
Title: Information on Royal Empress tree
Answered by: Barbara Medford


Would like to have some information on the royal empress tree; it is a non-native tree.


As a non-native, the Royal Empress Tree is not in our Native Plant Database. At the Lady Bird Johnson Wildflower Center we concentrate on plants native to North America. However, Paulownia tomentosa is not only non-native but is considered invasive in many parts of the country. That we ARE interested in. For some background, here is a previous Mr. Smarty Plants answer concerning this tree. There are a number of links in that previous answer to give you information on care, etc. As you can no doubt tell, we are NOT in favor of planting invasive trees. The USDA Plant Profile does not show it as growing in Michigan; the state may just be too far north, but it does grow in some northeastern states, so possibly it could survive Michigan winters. But do you want it to?

More Poisonous Plants Questions

Wisteria and Non-Poisonous Native Vines
February 15, 2012 - I'm from central Texas and I'm wanting to plant a native vine that will work well around the public, mainly kids. It's a mostly sunny trellis that makes an arch. I'd like to plant the native Wiste...
view the full question and answer

Horse-friendly plants for Powell OH
September 24, 2010 - I am looking for horse friendly plants, i.e., shrubs, trees, bushes, etc. that can be planted in wet area in Ohio. Thank you in advance for your assistance.
view the full question and answer

Evergreen trees for California that are non-toxic for dogs
February 19, 2014 - Hi, we live in California, San Bernardino County and would like to know what evergreen trees are safe to plant in our backyard with 2 little dogs being around. I did quite some search online but ever...
view the full question and answer

What caused bump after walk in woods from Ontario
July 25, 2011 - I recently went for a walk in the woods near a stream. When I got to the river my leg had a little bump. It wasn't itching. I got home, it swelled even bigger. Can you tell me what plant I bumped int...
view the full question and answer

Puppy-friendly privacy screen in Montana
November 02, 2012 - I need some puppy-friendly short(< 30') privacy from the gigantic windows of my next door neighbor. But- there are power lines above the area that I needed to plant! I had planned on an aspen grove, ...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
© 2015 Lady Bird Johnson Wildflower Center