Explore Plants

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
    
 

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 Shrubs Questions

Native shrubs or ground cover for north-facing landscape in Ft. Worth
March 23, 2010 - Need native plant ideas for a landscaping bed against the house facing north. Already has 1 Beautyberry but two others died of root rot last year due to incredibly high water table in our area. Old ...
view the full question and answer

When is the best time to transplant Esperanza bushe in Buda, TX?
September 04, 2013 - When is the best time to transplant an Esperanza bush? I want to move it because it is overwhelming my front yard. Thank you,
view the full question and answer

Plants for streambank area in Oregon
September 14, 2012 - I am ready to replant a streambank area with native plants..what do you recommend for the Willamette Valley in Oregon? Thanks much!
view the full question and answer

Spots on leaves of Esperanza from Dallas
May 30, 2012 - Have a new 1 foot high Esperanza. It is flowering OK (so far) but it has small rust colored spots about the size of a B-B all over most of the leaves. On the top side of the leaf the spot is depress...
view the full question and answer

Native plants for screen in Colleyville TX
March 12, 2009 - My soil is pure sand that goes down as far as I can dig. I am needing native plants to use as a screen, that grow to be 6-10 ft. tall. Also, since my plantings dry out so quickly, would it be helpfu...
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.