En Español

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

Please forgive us, but Mr. Smarty Plants has been overwhelmed by a flood of mail and must take a break for awhile to catch up. We hope to be accepting new questions again soon. Thank you!

Need help with plant identification, visit the plant identification page.

 
rate this answer
9 ratings

Saturday - October 06, 2007

From: Round Rock, TX
Region: Southwest
Topic: Herbs/Forbs
Title: Difficulties in growing iris in Central Texas
Answered by: Barbara Medford

QUESTION:

I live in Round Rock TX. I would like to plant Irises and have failed before. What type of irises grow best here? When should I plant them and should I add something to the soil to help them grow?

ANSWER:

Let's talk first about native or non-hybridized iris. There are 26 irises native to North America in our Native Plant Database. Of these, only 4 were shown to be found in Texas. Most of them seemed to favor the West Coast, or cool, wet areas. The four irises tough enough to grow in Texas are Iris brevicaulis (zigzag iris), Iris fulva (copper iris), Iris hexagona (Dixie iris), and Iris virginica (Virginia iris).

But, perhaps you were thinking of the Iris germanica, bearded iris. This USDA Plant Profile link refers to the I. germanica as "introduced"; that is, not native to North America. The USDA Plant Distribution Map at the same web location does not show Texas as one of the states where it is distributed. Of course, we know that many gardeners grow it here, but that perhaps gives us a clue to why it seems hard to do so. This site from Floridata will give you more information on the culture of I. germanica. It apparently began as a natural hybrid between I. pallida and I.variegata. Iris germanica is thought to be native to Southern Europe and the Meditteranean, and other species from Europe and Asia have been brought into the breeding, but it has become established all over the temperate world and can be found on road shoulders and old home sites throughout much of the United States and Europe. There are literally thousands of different irises, many of them with commercial cultivar names.

Now, we begin to see the value of using native plants, as promoted by the Lady Bird Johnson Wildflower Center. When you are dealing with a hybridized and/or non-native plant, you have no idea what characteristics it has bred into it, nor of the ideal way to grow it. With plants native to the area in which you are gardening, you don't have to make as many adjustments in water, fertilizer or even soil content, because you likely already have good conditions for the native plant to flourish.

 


Iris brevicaulis

Iris fulva

Iris hexagona

 

 

More Herbs/Forbs Questions

When to Collect Rudbeckia triloba Seed?
September 13, 2014 - How soon after flowering may I cut Rudbeckia triloba flower heads to save seeds? Do cones need to be attached to the plant in or out of the ground to continue to mature?
view the full question and answer

Wildflowers to complement Mexican hat in Texas
October 22, 2015 - We have 10 acres in Driftwood that has Mexican Hat pretty much everywhere that is not shaded. We are looking to add additional wildflowers to them in order to have color earlier and later in the seas...
view the full question and answer

Creekside Groundcover for Upstate New York
October 22, 2015 - I live in Upstate New York in Rochester. Our winters can have lows of -10 at night at times. I have 1,300 linear feet of creekside land that seniors can view from their homes. Because of the brush, it...
view the full question and answer

Care for Blackfoot daisy?
June 05, 2009 - Hi, I have two blackfoot daisies and one has died. I've planted them in full sun on a well drained slope. Do these ususally die after blooming? Should I cut the other one back? Thanks.
view the full question and answer

Drought tolerant ground cover for Midlothian, TX
June 17, 2012 - I'm looking for a fast, low ground cover. That is drought tolerant for a large slope.
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center