Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.
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.
From: San Jose, CA
Region: California
Topic: Trees
Title: Fast-growing tree, non-toxic for horses, in Northern California
Answered by: Nan Hampton
The trees listed below all have rapid growth and are not toxic according to the USDA characteristics links. They all grow in or adjacent to Santa Clara County:
Pinus jeffreyi (Jeffrey pine) Here is the USDA link to its characteristics. Here are photos and more information.Pinus lambertiana (sugar pine) Here is the USDA link to its characteristics. Here are photos.
Pinus radiata (Monterey pine) Here is the USDA link to its characteristics. Here are photos and more information.
Populus fremontii (Fremont cottonwood) Here is the USDA link to its characteristics.
Avoid all Quercus species (oaks) and Prunus species (plums, peaches, cherries, apricots, etc.). Also, do not plant Acer rubrum (scarlet maple) or any Acer species—see Cornell University Plants Poisonous to Livestock. The pines listed above are not listed on any toxic plant database but Pinus ponderosa (Ponderosa pine) does appear on several of the databases below and should not be planted near cattle or horses.
Here are databases that you can use to check on toxicity of plants to horses and other animals:
Toxic Plants from the University of California-Davis
Pennsylvania's Poisonous Plants from the Universtiy of Pennsylvania
Cornell University Plants Poisonous to Livestock
ASPCA list of Plants Toxic to Horses
Horse Nutrition: Poisonous Plants from Ohio State University Extension Service
10 Most Poisonous Plants for Horses from Equisearch
Problems with a Sherman (Shumard?) Oak from Bixby OK
May 14, 2012 - We have done extensive research on oak fungi/diseases/pests could be affecting our Sherman Oak tree but we are stumped. The leaves are falling off and have some sort of moldy bunch within the leaf it...
view the full question and answer
Tree to plant by pool replacing mulberry in Las Vegas
January 18, 2009 - I am looking for a tree to plant between my house and pool. We just cut down a mulberry that was here due to its invasive root system. Are there any plants that can tolerate Vegas weather, provide a...
view the full question and answer
Identification of tree with red feathery leaves
March 08, 2012 - What is the name of a tree with dark red leaves, feathery, slim trunk; maybe in the pepper family? Jedi?
view the full question and answer
Removing a non-native windmill palm from Austin
February 27, 2013 - I have a fairly good size windmill palm (about 15ft high) that is planted too close to the house. I also don't like having to constantly remove its fronds as they block a walkway. Is there a good wa...
view the full question and answer
Tree for a Missouri yard
March 10, 2012 - Our front yard tree died. We have landscaping that needs shade. We are in Zone 5, looking for a fast/medium growing shade tree that does not produce anything that falls into the grass and will allow t...
view the full question and answer
![]() |
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. |