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
2 ratings

Tuesday - October 02, 2007

From: Plano, TX
Region: Southwest
Topic: Propagation
Title: Prosopsis velutina (velvet mesquite), Larrea tridentata (creosote bush), rain smell
Answered by: Nan Hampton

QUESTION:

I am an El Paso native living in Plano TX. I terribly miss the smell of rain in El Paso and have learned that this smell is due to the velvet mesquite tree and also the creosote bush, among other things. I wanted to know if these were native enough to survive in Plano, and if planting was recommended. If you have more information on what vegetation causes the wonderful smell of rain in El Paso and how I can duplicate it in my yard, I would appreciate it. Thanks.

ANSWER:

Prosopis velutina (velvet mesquite) is native to the desert areas of California, Arizona, Mexico and New Mexico—but obviously "leaks" over into Texas near El Paso. An info sheet from the AHS (American Horticultural Society) states that it does well in the USDA Plant Cold Hardiness Zones of 7-9 and the AHS Plant Heat Zones of 10-7. Plano, in zone 8 for USDA and 9 for AHS, falls well within those ranges. The range for Larrea tridentata (creosote bush) is USDA 8-11 and AHS 12-8, so it also falls within the range of Plano for temperature extremes. However, soil moisture would probably be the biggest deterrent for success of the two species in Plano since the average rainfall for Plano is 29 inches and the average rainfall for El Paso is about 9 inches. As a possible substitute, another mesquite, Prosopis glandulosa (honey mesquite), is native to the Plano area. I'm not aware, however, that it is noted for its pleasant smell after a rain. You should be aware, also, that farmers and ranchers often consider mesquites noxious weeds (even though they are native) and spend a lot of time trying to keep them under control.

In addition to the volatile oils from plants, a big contributor to the distinctive smell that comes after rain is soil bacteria. You should certainly still be able to experience this smell in Plano.

Mr. Smarty Plants has been assuming that you are talking about the distinctive smell that follows a rain, but people also report a unique smell that comes right before a rain. The smell BEFORE the rain has been attributed to a chemical called Petrichor, or in chemical terms—2-decanone. The chemicals that are constantly being volatilized and released from trees and other plants can be absorbed by rocks. The increase in humidity right before a rain has the effect of releasing these chemicals from the rock and creating the smell. Velvet mesquite and/or creosote bush must have this chemical in their makeup if they are contributing to the before-rain smell.

 

 

More Propagation Questions

Winter care of Asclepias tuberosa from Austin
October 31, 2013 - We have several asclepias tuberosa (Butterflyweed). Monarch caterpillars have found and denuded them. We are excited about all of the Monarch caterpillars, but unsure of what to do next. What do we...
view the full question and answer

Comparative speeds of flowering from seeds or bulbs
March 24, 2006 - Does a seed flower grow faster than a bulb flower?
view the full question and answer

Grow bluebonnets in Virginia
September 04, 2007 - I want to ATTEMPT to grow some Texas Bluebonnets in VA because I am homesick and both our kids are back in Austin. That said, the site says " it may be necessary to inoculate the soil with a rhizobiu...
view the full question and answer

Scarifying seeds of evergreen sumacs from Lockhart TX
May 19, 2013 - Dear Smarty Plants, We would like to grow our own evergreen sumacs. Consulting Nokes book, How to Grow Native Plants on page 310, it says to scarify fresh uncleaned seeds for 30-45 minutes. On page...
view the full question and answer

Failure of hybridized red hollies to grow
April 17, 2008 - I have 2 red hollies planted in my yard about 20' apart, 3 years now. They won't grow. Do I need to have a male with them?
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