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

Tuesday - September 12, 2006

From: Pasadena, MD
Region: Mid-Atlantic
Topic: Diseases and Disorders, Trees
Title: Yellowing of Thuja occidentalis leaves in early Fall in Maryland
Answered by: Joe Marcus

QUESTION:

Mr. Smarty Plants, I am from Maryland. Please help. I have planted 23 Thuja occidentalis Smaragd in my front yard a few months ago. Height of about 3 feet. Most of the trees have turned golden brown. Are they dead? or is that normal. What did I do wrong? They are suppose to be evergreens. Thanks Bonita

ANSWER:

Thuja occidentalis or arborvitae is an evergreen species. While it is normal of arborvitae - especially certain cultivars - to turn reddish-yellow during winter months, it is not normal for that to happen this time of year.

Some possible causes for your plants' condition are water stress (too much or too little), root disease which is usually related to watering issues, transplant shock, leaf miners or mites. From your description of your plants we would say that leaf miners and mites are not the likely culprits, but we can't rule them out. More likely, there is some issue involved in the transplanting and acclimation process that caused you plants to turn brown.

You should talk to your local nurseryman, arborist or cooperative extension service about the problem as someone may need to actually see your plants to give you a proper diagnosis. You are fortunate in the state of Maryland to have an excellent cooperative extension service. Their really nice Home and Garden Information Center website provides information for investigating plant problems.

 

More Trees Questions

Brown spots on young redbuds in Lincoln TX
August 01, 2010 - I have lined my driveway in Lee County Texas with Red bud trees purchased both in Dripping Springs and in College Station. The 14 trees are of varying ages and heights (planted during the fall and wi...
view the full question and answer

Flowers under pine trees from Elkhart Indiana
May 02, 2013 - I have a number of pine trees at the back of my lot and would like to plant flowers under the tree. What can I plant?
view the full question and answer

Runaway growth on mountain laurel in Coolidge AZ
July 01, 2010 - I have 2 mountain laurels. They are thriving well. In fact one is growing way too fast. I am growing it as a tree, but the branches are in excess of 6 feet, while the trunk is only 18 or so inches. I ...
view the full question and answer

Native plants for city lot in Longview, TX
March 19, 2008 - Just bought a city lot in Longview, TX and want to put in some plants at the periphery even before the house is built. Can you recommend any that would be from your list of East TX plants that are pa...
view the full question and answer

Damaged Shumard oak tree in Polk County Texas
July 24, 2010 - I have a native Shumard Red Oak on our property in Polk County Texas that suffered damage (top blown out) during Hurricane Ike. Last year, one side of the tree browned early while the other side stay...
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 | STAFF
© 2015 Lady Bird Johnson Wildflower Center