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?


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
Not Yet Rated

Wednesday - April 16, 2008

From: Georgetown, TX
Region: Southwest
Topic: Non-Natives
Title: Disease on non-native French hollyhocks
Answered by:


I live in Georgetown, Texas. I have some French hollyhocks that have some kind of disease on the leaves - I would like to know what to spray them with to get rid of it. It looks like brown blemishes all over the leaf and the blemishes are small and round. It really looks gross. One of our local nurseries said it might be a bacteria of some kind but they weren't that helpful. I pulled off the infected leaves and the new growth eventually got the same thing. Please help! The plants have been hearty and a dark green until about a month ago.


The French hollyhock is a lovely old garden flower; in fact, legend has it that Thomas Jefferson grew it at Monticello. That does not mean, however, that it is native to North America, indeed, it is native to Europe, north to Scandinavia and east to Russia and the Caucasus. The Lady Bird Johnson Wildflower Center is dedicated to the care and propagation of plants native to North America, so this is a little out of our field of expertise. However, we are always glad to help out, if we can, with problems gardeners are having with their plants. We hunted around for information on Malva sylvestris, French hollyhock, and mostly found that it had no serious insect or disease problems, although Japanes beetles can be a problem, where present. We did find one reference with said that the Malva sylvestris can be prone to rust fungus. Not having a clue what that was, we searched some more and found this website on rust fungus that is probably going to tell you more than you ever wanted to know, but there are a lot of pictures you can compare to the blemishes on your flowers. If you feel that is the problem, ask your nursery to recommend a good fungicide, and apply it exactly as instructed. Good luck!


More Non-Natives Questions

Identifying problem with non-native plumbagos in San Antonio
November 21, 2009 - Barbara Medford answered my question on plumbagos..we have the ones that grow crazy in TX (not sure which species, but w/ the bright blue/purple blooms..). I have pictures and wasn't sure where to se...
view the full question and answer

Failure to thrive of non-native Purple Orchid Tree
March 09, 2009 - We planted purple orchid tree Texas,zone 9 two weeks ago and all leaves turned brown.My husband used root stimulator with enough water as the instructions said.We took all brown leaves off and now it...
view the full question and answer

Information about non-native Canaga odorata, ylang-ylang
July 10, 2008 - can you tell me the composition of canaga odarata or ylang-ylang flower? also, beneficial effects? it's for my science project..
view the full question and answer

Pruning Citrus Suckers
October 06, 2014 - Mr. Smarty Plants, you are the only person that has "not" insisted that the little balls on Satsuma and lemon trees were clumps of bugs. They are surely what you described in the answer to my previo...
view the full question and answer

Non-native genista racemosa from Leander TX
March 28, 2012 - Hello, Mr. Smarty Plants. I fear I've made a horrible purchase at a local plant place. Bought a "broom" plant--it's not listed in your database. Latin name: genista racemosa, according to tag. ...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
© 2015 Lady Bird Johnson Wildflower Center