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
4 ratings

Sunday - January 31, 2010

From: Austin, TX
Region: Southwest
Topic: Non-Natives
Title: Non-native Dietes bicolor leaves brown after freeze in Austin
Answered by: Barbara Medford

QUESTION:

I live in Austin, and my butterfly iris (Dietes bicolor) that I've had for the last 6 years are all turning brown after the most recent freeze. Should I cut them back, with the thought being they would sprout new growth? Or are they dead, and should be dug up and replaced?

ANSWER:

Dietes bicolor, Butterfly or African iris, is a native of South Africa, and therefore out of the purview of the Lady Bird Johnson Wildflower Center, where we are dedicated to the use, care and protection of plants native not only to North America but to the area in which they are being grown.  Both it and members of the genus Iris are related distantly by being part of the family Iridaceae. We can tell you that the Dietes is hardy from Zones 8b through 11; they are evergreen through the winter unless the temperature goes below 25 deg. F., at which time the leaves will turn brown. Since this plant regenerates from a rhizome, it will no doubt come back in warmer weather. We would suggest simply trimming down those browned leaves and not fertilizing.
 

More Non-Natives Questions

Non-native Sago palm roots damaging house foundation from Keystone Heights FL
July 03, 2013 - Will sago palms roots hurt a house's foundation if too close?
view the full question and answer

Cuttings for non-native red-tip Photinia
April 27, 2009 - We have had wonderful fortune with red tip Photinia.We would like to expand our plantings.Can red tip Photinia be propagated by hard wood cuttings?
view the full question and answer

Browning of non-native Plectranthus in Dallas
November 28, 2010 - I live in Dallas and planted 'Mona Lavender' which is now brown and limp after overnight temps in the low 30's. Is it dead or will it come back? Do I need to cover these plants during the winter m...
view the full question and answer

Control of non-native invasive Japanese Barberry from Enfield NH
April 22, 2014 - I recently bought a home that is bordered by woods and a sizable area of invasive Japanese Barberry growing on a steep hill in and around a stone wall making it that much harder to dig up. I've alway...
view the full question and answer

Yellowing leaves on non-native Betula pendula
July 03, 2008 - I live in Puyallup, Washington. I purchased and planted a weeping birch on June 21, 2008. For the first few days all seemed well and the tree seemed to be settling in to its new home. Less than e...
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 | SITEMAP | STAFF
© 2016 Lady Bird Johnson Wildflower Center