En Español

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

Please forgive us, but Mr. Smarty Plants has been overwhelmed by a flood of mail and must take a break for awhile to catch up. We hope to be accepting new questions again soon. Thank you!

Need help with plant identification, visit the plant identification page.

 
rate this answer
Not Yet Rated

Thursday - April 01, 2010

From: Hillsboro, OR
Region: Northwest
Topic: Diseases and Disorders, Trees
Title: Why are my lemon Cyprees trees turning Black?
Answered by: Jimmy Mills

QUESTION:

I have 3 lemon Cypress plants - all are about 6 feet tall. One of them has started turning black on one side - like it's been burnt. The inside of the plant is also turning black. I assume something is eating it from the inside out. What can I do to stop it?

ANSWER:

Lemon Cypress is a cultivar called Goldcrest or Golden Crest of  Cupressus macrocarpa (Monterey cypress). This link from Floridata provides general information about the plant.

The TopiaryShop recommends checking your plants for aphids. They secrete a substance called honeydew which can give the plant a black sooty appearance from sooty mold growing on the honeydew.

It is difficult for us to diagnose plant diseases from a distance, so I'm going to suggest that you contact the folks at the Washington County Office of the Oregon State University Extension Service for some help closer to home.

 

 

More Trees Questions

Evergreen plant to grow to 6 feet tall with flowers and non-toxic
November 04, 2013 - I live in South Texas, and in town. I am looking for plant that grows taller than 6 feet and is non toxic to people and pets. Would also like for it to be pest and disease free or minimal. Need it ...
view the full question and answer

Will deer eat lemon cypress trees from Hayden ID
June 02, 2012 - Do deer eat lemon cypress trees? We do not think so since they are so spiny, but wanted a clarification.
view the full question and answer

Pruning Bald Cypress in Wylie, TX
January 02, 2010 - I have a 6 year old bald cypress that sustained damage to the upper portion of its trunk a couple of years ago. Since that time it has grown more outward than upward and developed a rounder shape. I...
view the full question and answer

Problem with oak trees in Mansfield, Texas
September 26, 2010 - We have lost 2 large oaks last year & now another is nearly gone. It has several large patches of missing bark - beneath a thin layer of skin-like membrane that seemed to separate it from the bark i...
view the full question and answer

How to tell the girls from the boys in wax myrtles (Morella cerifera)
May 14, 2010 - How would I be able to identify whether my wax myrtles are male or female plants? I was given two plants last fall (that came from a family members back yard) and the person who gave them to me didn'...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center