From:Austin, TX Region: Southwest Topic: Non-Natives Title: Non-native Dietes bicolor leaves brown after freeze in Austin Answered by: Barbara Medford
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?
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
Willow woes in Philadelphia, NY August 22, 2010 - I have a 2 yr old willow; it is August and it looks like the tree has gone dormant, is this normal? view the full question and answer
Non-native, invasive Asiatic Jasmine from Austin October 25, 2012 - Is Trachelospermum asiaticum considered a native texas plant? Is there an example growing at the Center that can be viewed?
view the full question and answer
Difference beteen two non-native photinias from Nashville TN June 07, 2013 - What is the difference between red tip phontinias and fireball phontinias. I read that fireballs are also called red tips but I thought that red tips grow to like 12 ft. and the tag on the fireball I... view the full question and answer
Cultivation of non=native Brugmansia sanquinea January 04, 2006 - I have had an Angel Trumpet since spring 2004, I keep it indoors in about 5 hours of sun a day. It is about 5 feet tall and was loaded with leaves. At Christmas time I had to move it from the front wi... view the full question and answer
Loss of leaves from globe willows in Utah July 26, 2008 - I have four globe willows that have been in my back yard for the past 6 years. For the past month they have been losing their leaves from the bottom up. We had aphids in some of our other trees and ... view the full question and answer