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Weed control, management, ecology, and minutia
by Greg Shell
on May 13, 2012 at 3:49 PM
The lawn in question has Kentucky blue grass in the back and creeping bent as the front. The residence is in Milwaukee, WI. Dandelions and crabgrass are the invasive species with neighbors yard abundant with both. What treatment of HEDTA would be most beneficial to the lawn in question.  
An article in the Milwaukee Journal Sentinel by Melinda Myers discusses this product; however, does not address the concentration factors appropriately?
Reply by Brad Hanson
on June 28, 2012 at 6:43 PM
A followup to your question based on some information I received via email from someone who works for the registrant of an iron-HEDTA product.  
Dear Dr. Hanson,  
My name is xxxxxx xxxxx and I work for Neudorff, a manufacturer and registrant of reduced-risk pesticides. We are the registrant on iron-HEDTA, the chelated-iron selective herbicide evaluated by Dr Wilen. I am writing about the question raised by Mr. Shell to which you replied. These products, consumer, RTU, and the commercial concentrate, called Fiesta, all present some risk of phyto-toxicity to bentgrass and are labeled specifically ‘do not apply to bentgrass’ (
by Brad Hanson
on May 13, 2012 at 4:20 PM
In a cursory search, it looks to me like most of the HEDTA formulations are premixed and should not be diluted. The labels that I looked as usually said something along the lines of "spray target plant thoroughly" and "do not dilute" the product. Perhaps somebody in Wisconsin can chime in and offer more local experience.
by Larry F.
on August 26, 2014 at 7:31 PM
In my unscientific research in my weedy lawn, I've observed the following:  
1. It's less effective on weeds with oily leaves, like the black medic mentioned in the article. There needs to be testing to find a suitable and compatible surfactant.  
2. Larger weeds may take two or three treatments. Initially, the plant may appear to be dead but new green growth may appear and will need to be treated.  
3. It kills morning glories much more quickly than Roundup.  
4. The concentrate seems to be difficult to find.
by Brad N.
on March 31, 2015 at 9:49 AM
Has anyone tested this product on Dollarweed or have any reason to believe it will or will not work?
by Pat Jeffries
on April 6, 2015 at 10:43 AM
My question is can you safely use Iron X on grazing pastures for cattle & horses? Can you turn them onto the treated field within a certain amount of waiting or is it toxic to them. My pasture is 40% choked with butter cup. Ant info would be appreciated. Pat J
by Virginia Winter
on May 15, 2015 at 9:02 AM
I'm finding it harder to find different sources now. In the past I've bought Iron-X, Fiesta and Ortho Ornamentals. Does anyone know why the last two products seem to have been discontinued? I'm looking for larger quantities than I can get through Iron-X and Bayer Advanced Natria Lawn Weed Killer.
by Sandra Eyre
on May 28, 2015 at 7:22 AM
Is it safe for my dog to be on the grass after this Fehedta has been applied to the grass? Or,is there a time frame? I await your reply  
Thank you
by Top Notch Quality For Less
on July 9, 2015 at 2:41 PM
You can purchase the Fiesta product in 1 gallon or 2-1/2 gallon containers on eBay with free shipping in the USA. Fiesta is concentrated and must be diluted with water prior to use so you money goes much further compared to a ready to use product like (brand name removed by MOD) or (brand name removed by MOD).
by george thomas
on April 13, 2016 at 12:08 PM
has anyone tried Iron X on lesser celadine?
by Anne Furman
on May 8, 2016 at 8:01 AM
I am repeating George Thomas' question about Iron X on celadine. Does it work? I think I will do a bit of experimenting as it is becoming rampant in my neighborhood.
by Brad Hanson
on May 9, 2016 at 7:44 AM
I'd be surprised if HEDTA products works well on a perennial plant like celadine. My guess is that, at best, it would be damaged and likely to regrow. Give it a shot and let us know.  
by Stefan
on October 11, 2016 at 10:02 AM
I did two application of Iron! (or Fiesta). It did just very little. Very very low effectiveness. Read here more: [link deleted by moderator]
by Anne
on April 30, 2017 at 11:34 AM
The IronX works great on dandilions, but one must take off the flowers and buds. Fine for my lawn where I can go out every day and spend 30 minutes popping off flowers and buds, then spray. Also working on Creeping Buttercup, Ranunculus repens and Slender Speedwell, Veronica filliformis. Repeated applications to Celadine may be working but I need to put up a marker as I only have a couple of suspects I am spraying. But the big problem now is garlic mustard. Ugh.
by Margaret Cassidy-Baca
on June 22, 2019 at 10:22 AM
"Pulverize Weed Killer" by Messina, active ingredient FeHDTA. Is FeHDTA toxic to pollinators, such as bees?
by Daniel Drake
on March 20, 2020 at 2:19 PM
A helpful discussion here, but there's one question that I can't find answered anywhere:  
In the labelling on Active-X, or anywhere else I find in a search on FeHEDTA weed-killing preparations, I find no indication of what sort of "Other Ingredients" make up the remaining 73+% of the formula? If it's all H2O, fine. If it includes other things to enhance the weed-suppressing effects, maybe not so fine for my purposes.  
Is such information available anywhere?
by Rosemarie C Schmidt
on April 26, 2021 at 3:16 PM
Will it work on maple tree seed pods?
by Benjamin Putney
on June 12, 2021 at 11:12 AM
While I don't have that specific information based on the understanding that this is a systemic poison the danger to bees is likely low to none. That being said you should always observe proper application safety and apply during safe times.  
Apply the weed killer at night, early mornings, and in the late evening, which are the times that bees won't be foraging. Between 8 pm and 8 am, the evening applications lead to minimum bee contact with the weed killer.
by hooshang pakdel
on October 29, 2021 at 12:50 PM
There are two types of chélating agents: Fe-EDTA and Fe-HDETDA. I believe both are good for lawn treatment. Any comments?
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