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 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 Diseases and Disorders Questions

Recovery from transplant shock for bougainvillea
July 12, 2007 - I live outside of Phoenix. I just bought a bougainvillea in a large pot. It was doing nicely until I brought it home. I placed it in a sunny spot in my front yard inside of a large volcanic rock that ...
view the full question and answer

Sooty Mold on Beauty Berry
May 19, 2009 - We recently planted a beauty berry plant (among others) to attract birds in our backyard. We have had a lot of rain (probably 5-7 inches) since planting a few weeks ago if that might have something to...
view the full question and answer

Problems with transplanted Texas Madrones from Junction TX
May 13, 2014 - We planted 3 little Texas madrones last year 9 - 12 inches high. 2 of them seem to have some kind of black blight along the edges of the leaves that I don't think was the result of our late freezes. ...
view the full question and answer

Need to know about little brown spots on Texas Mountain Laurel
May 11, 2015 - I have little brown spots on my Texas Mountain Laurel leaves. I can email you a picture if needed. What could it be and how can I help my little laurels work thru these spots? The texas mountain ...
view the full question and answer

Time for trimming oaks from Boerne TX
July 03, 2012 - I want to trim a native red oak but am scared to touch it because I dont want to lose it. It is the primary source of shade in our back yard. Also I want to trim the live oaks and am surrounded with O...
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