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

Thursday - April 10, 2008

From: Rigby, ID
Region: Rocky Mountain
Topic: Poisonous Plants
Title: Fast growing trees in Idaho
Answered by: Barbara Medford

QUESTION:

I want to plant fast-growing trees on my property in Idaho. What trees are poisonous to horses and dogs? I am particularly interested in the Royal Empress (Paulowmia) tree and the dogwood tree.

ANSWER:

We don't like to start out with discouraging words, but Paulownia tomentosa is NOT a good choice. We have been asked about it several times, and would like for you to read a previous answer from Mr. Smarty Plants on the subject. Next, read this site from the Plant Conservation Alliance "Least Wanted" List. It appears that some have already escaped cultivation and invaded Idaho; but, under the circumstances, we certainly hope you do not contribute to the problem. The tree is a native of China and, as such, is not normally in the purview of the Lady Bird Johnson Wildflower Center. Our focus and concentration is on plants native to North America; however, we are very interested in invasive plants, especially non-native invasives.

Now, on to the dogwoods, genus Cornus. We found fourteen species of Cornus on our Native Plant Database, of which four can apparently be grown in Idaho.

Cornus canadensis (bunchberry dogwood) This is really a low-growing groundcover type of bush, probably not what you had in mind.

Cornus nuttallii (Pacific dogwood) This USDA Plants Profile shows the areas in Idaho where this species is growing naturally. It is a deciduous tree up to 40 feet tall that does best between 3000 and 8000 feet in altitude. Unfortunately, it is very susceptible to dogwood anthracnose, which has killed many larger plants in the wild and also restricts its use as an ornamental tree.

Cornus sericea (redosier dogwood) Both of these sericea dogwoods are recommended for Idaho, and are useful for erosion control.

Cornus sericea ssp. sericea (redosier dogwood)

Since none of these seem to be the perfect choice, how about some alternatives? First, for the Empress Tree. We went to our Invasives website and found four alternatives to this tree; unfortunately, none of them are recommended for Idaho. So, we went shopping in the Recommended Species for Idaho section and have four tree suggestions. We realize that you wanted fast-growing, blooming trees, but it may be that is not going to happen in Idaho.

Acer grandidentatum (bigtooth maple)

Betula occidentalis (water birch)

Pinus contorta (lodgepole pine)

Prunus virginiana (chokecherry)

And, finally, your question about what trees are poisonous to horses and dogs. Rather than reproduce the list, let us refer you to this Poisonous Plants Informational Database from Cornell University.


Cornus canadensis

Cornus nuttallii

Cornus sericea

Cornus sericea ssp. sericea

Acer grandidentatum

Betula occidentalis

Pinus contorta

Prunus virginiana

 

 

 

More Poisonous Plants Questions

GMO/GE crops killing wildflowers and insects
October 31, 2008 - Hi, I've read where GMO/GE crops in other countries were killing the wildflowers and insects adjacent to those fields. Have you had any reports of this North America. Best regards.
view the full question and answer

Identification of shrub/small tree with small purple fruit
July 31, 2013 - Hi! I have a tree/bush that has come up on its own in the backyard. This year it set what looks like small purple plums. Is there any chance that they might be poisonous?
view the full question and answer

Poisonous plant in Ohio with hydrangea-like flower
June 09, 2008 - Dear Mr. Smarty Plants, I was sure that I had read that there is a poisonous bush that is native to Ohio that has flowers something like a white hydrangea..or was it queen ann's lace? I believe the ...
view the full question and answer

Is it possible to eat one nightshade berry and live?
September 16, 2012 - Can I eat one nightshade berry and live? I am 18.
view the full question and answer

Toxicity of Peruvian Lilies (Alstroemeria sp) for food decoration
September 04, 2006 - Hi, I am trying to find out if I can decorate a cake using live alstroemeria laid on top of the icing. I would not want to eat the flower, just lay it on top to look pretty before removing and servi...
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