En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Fast growing trees in Idaho

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

Sturdiness of non- native poisonous oleanders
August 16, 2011 - We've seen a dozen different types of non-native plants in our yard perish in last winter's brutal freezes and this summer's record drought..which is good..except for the Oleanders, which nature ca...
view the full question and answer

Identity of poisonous thorn bush in Montgomery Texas
May 29, 2012 - What is the name of a poisonous thorn bush in Montgomery Texas?
view the full question and answer

Fall care for Fan Scarlet lobelia in Rock Island IL
November 09, 2009 - What do I do with Scarlet Fan lobelia in the fall; do I cut it back or let it go as is?
view the full question and answer

Smarty Plants on Poisonous Plants
October 27, 2004 - Hi Mr. Smarty Plants, I wonder who among the wonderful staff at the Wildflower Center can answer this. I occasionally get requests for information on toxic or irritating plants. Beyond the obvious ...
view the full question and answer

Is Florida anisetree appropriate for school planting in New Orleans?
April 22, 2010 - Illicium floridanum, Florida anisetree We are considering using this plant for a landscape at a school. I have been informed that it is poisonous, but not by a reliable source. I am otherwise very...
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