En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Cottonwood seed clogging air conditioner in Austin

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

Sunday - June 06, 2010

From: Austin, TX
Region: Southwest
Topic: Trees
Title: Cottonwood seed clogging air conditioner in Austin
Answered by: Barbara Medford

QUESTION:

My husband and I recently moved into a rental house that has a very tall cottonwood tree in the backyard. It has been shedding its seeds all over our yard since the beginning of May and seems to still be going full speed. It looks like snow, but snow that clogs up our A/C unit. I would like to know how much longer it will probably be seeding (we are in south Austin, 78744) and if you have any suggestions for our landlord as to how we can save our A/C unit from being constantly clogged.

ANSWER:

Populus deltoides (eastern cottonwood) is native to Travis County and its seeds have long been the bane of anyone living around it. In particular, those flying puffs of cotton are extremely allergenic. The cottonwood itself is not very popular, as it tends to drop big limbs, has large roots, and weak wood. It grows very fast, particularly in a moist area, and you can still see them coming up in creek beds in Texas. We found a website from Hortiscope Questions on Cottonwood that has all kinds of good information, including the name of a product thought to inhibit the cotton production. We were never able to find any information on how much longer the cottonwoods will be flying cotton in the Austin area, but the above-mentioned website said that it usually lasts about 4 weeks. Depending on where the tree is growing, of course, that will be earlier or later in the Spring than now. 

In terms of a filter for the air conditioner, that is out of our line of expertise. We recommend you or your landlord contact an air conditioning contractor. If there are many cottonwoods around, you can bet this is not the first time this question has been asked, and the contractor should have some sort of solution.

By the way, after many questions on how to stop the cotton flying, the author of the article we referenced, Ron Smith, Horticulturist for the North Dakota State University Extension Service, said the only way he knew of was to cut the tree down.

From our Native Plant Image Gallery:


Populus deltoides

Populus deltoides

Populus deltoides

Populus deltoides

 

 

 

More Trees Questions

What will grow under neighbor's overhanging tree in Grosse Pointe Woods MI
May 29, 2011 - My next door neighbor has a beautiful tree that is easily 60 years old and thus not going anywhere. Unfortunately, for me the roots of this tree have extended under a large corner of my back yard. Add...
view the full question and answer

Color year round, welcome to Austin Texas.
December 04, 2011 - I am new to Austin and want to plant colorful flowers for fall and winter that get a "wow" reaction. I have not seen much at the local nurseries. Any and all suggestions are greatly appreciated!
view the full question and answer

January good time to plant live oak in January from Manor TX
January 19, 2014 - I want to plant a Live Oak in January. Is this a good time to plant it?
view the full question and answer

Law against planting cottonwood in Madison WI
October 08, 2013 - I was told that there is an ordinance against planting cottonwood trees in Madison, WI. Is this true?
view the full question and answer

Need a tree to grow in the middle of a retention pond in Pennsylvania
June 03, 2010 - I have a shallow retention pond in my yard in South Eastern Pennsylvania. The pond is used for rainwater runoff and also for natural springs that are located below the surface. If I plant a tree in th...
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