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
1 rating

Thursday - July 10, 2008

From: Wanette, OK
Region: Southwest
Topic: Non-Natives, Compost and Mulch, Diseases and Disorders, Shrubs
Title: Rust spots on non-native red tip photinia
Answered by: Barbara Medford

QUESTION:

I live in Oklahoma and my red tips have rust spots on leaves and some plants are losing leaves. This is a clay soil; can you give me any info. on how to solve this problem?

ANSWER:

For openers, the red-tip photinia is non-native to North America, originating in the Far East. At the Lady Bird Johnson Wildflower Center, we are committed to the planting, protection and propagation of plants native to North America. Native plants are recommended because they are adapted to an area's soil, rainfall, heat (or cold), and so require less water, less fertilizer, less maintenance. We're not saying that your plants are suffering because they're non-native, necessarily, but that choosing the right plant, in advance, can save you a lot of grief and probably money because of lost plants. Unfortunately, the red tip photinia has been widely overused because it is cheap, fast-growing and the red leaves in the Spring are quite attractive.

In this Mississippi State University Extension Service Red-tip Photinia Almost Eliminated, you will likely find out why your plants are not prospering. Here is a quote from this article:

"Red-tip is highly susceptible to the fungal pathogen known as Entomosporium that causes leaf spots and ultimately defoliation. The disease has all but eliminated Red-tip from the list of recommended shrubs for Southern landscapes. In fact, the disease is so widespread that one plant pathologist jokingly explained that there are two types of Red-tip, those that have the disease and those that are going to get it! So, even though newly planted Red-tip bushes may stay disease free for many years, ultimately they will succumb to the inevitable."

Cotton Root Rot is also responsible for the loss of many ornamental plants in clay soil, and photinias are especially vulnerable. An article by Lynn Rawe from the Texas A&M Home Horticulture site describes the symptoms. There is no cure.

We're sorry that we can't give you the name of a spray or fungicide that would cure these plants, but we're afraid there is no such panacea. If the seemingly inevitable happens, try replacing the plants with plants native to Oklahoma, and tolerant of clay soils. However, if the clay is very dense, there will probably be drainage problems for any replacement, as well. If and when the photinias die, remove them and dispose of them in such a way that whatever disease has killed them will not be readily able to spread to other plants. Then incorporate compost or other humus into the soil, digging and mixing it deeply, and raising the bed, again to improve drainage. Don't try to plant new shrubs until late Fall, so they won't suffer from heat shock. Mulch them with shredded hardwood mulch, which will help keep the roots cool (or warm) and, as it decomposes, add still more organic matter to the soil, and keep this mulching up.

 

More Compost and Mulch Questions

Fast-growing vine for cinder block wall in Albuquerque
July 26, 2010 - I live in Albuquerque, N.M. and have a cement/cinder block wall and was wondering if there is a vine I can plant which will be easy to grow, grow fast and cover my wall without any type of help like a...
view the full question and answer

Disposal of Ashe juniper from Austin
March 07, 2013 - I am in western Travis County and we have been clearing our land of some of the Ashe Juniper. When there is not a burn ban, we burn them because there are just too many to shred. I was wondering if ...
view the full question and answer

How to grow milkweeds (Asclepias spp.) for monarch butterflies
March 31, 2010 - I tried and tried and tried to grow Asclepias viridis, A. asperula and even A. oenotheroides from seeds and even tubers for fourteen years! Do you have advice for growing these and other milkweed plan...
view the full question and answer

Chlorosis in tropical milkweed and asclepias tuberosa
May 18, 2008 - I planted both tropical milkweed and asclepias tuberosa. Both are chlorotic and the native milkweed has brown upturned leaves. Could it possibly be too much water? Or what?
view the full question and answer

Stumps of fallen oaks in Hurricane Irene from Newton PA
September 03, 2011 - Two large red oaks fell in the woods in our yard in Newtown PA due to Hurricane Irene. The trees have been removed, but the stumps remain. Please can you recommend some fast-growing, attractive, nativ...
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