All Things Gardening forum: Horseweed control

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Name: Jai or Jack
WV (Zone 6b)
Om shanti om.
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Jai_Ganesha
Apr 8, 2017 11:27 PM CST
I have some horseweed problems in my poppy bed because when both plants are small they form little rosettes in late winter and they are hard to tell apart until right about now when the rosettes start to form larger leaves.

I usually pull the horseweeds by hand once I can distinguish them but I was doing some online research and came across this article from Washington University, which explains why horseweed is so ubiquitous--herbicide resistance.

Spraying resistant horseweed under cold conditions circumvented the resistance mechanism. All of the cold-acclimated horseweed treated with herbicide at normal field-rate levels or higher succumbed to its lethal effects (top). Resistant horseweed plants maintained under warm conditions survived treatment...


From: https://source.wustl.edu/2011/...

Just wanted to share for folks who may be dealing with horseweed problems. It looks like the key to getting rid of it may be to spray when it's still cold out. Since horseweed sprouts in late winter this is more doable than for many other unwanted plants.
Keep going!
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
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DaisyI
Apr 9, 2017 12:15 AM CST
Oh, that's what that weed is called. D'Oh! Thanks Jai!
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

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Name: Jai or Jack
WV (Zone 6b)
Om shanti om.
Container Gardener Multi-Region Gardener Garden Photography Amaryllis Zinnias Gardens in Buckets
Region: Pennsylvania Annuals Houseplants Plant and/or Seed Trader Birds Garden Ideas: Level 1
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Jai_Ganesha
Apr 9, 2017 12:44 AM CST
You're welcome. It's native to the United States so it can't really be called "invasive," but it is very much aggressive.

Mine start growing at the same time as my poppies, in late winter when temperatures are below freezing at night. And it survives basically everything, even deer, drought, flooding, being cut down, you name it (including herbicides). It's remarkably tough.
Keep going!
Name: Philip Becker
Fresno California (Zone 8a)
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Philipwonel
Apr 9, 2017 12:11 PM CST
Jai: I hate that stuff. I'm glad i dont have much of it. I hand pull it. If it gets to 6 inches or so, the SOB'ing stuff cant be pulled up. Tap root, goes to kingdomcome and more !!!
Spray at least twice with round up to kill it.
@Daisyl : I never knew what it was called, also ! All i knew is... Its one of my hell weeds ###
😎😎😎
Anything i say, could be misrepresented, or wrong.
Name: Jai or Jack
WV (Zone 6b)
Om shanti om.
Container Gardener Multi-Region Gardener Garden Photography Amaryllis Zinnias Gardens in Buckets
Region: Pennsylvania Annuals Houseplants Plant and/or Seed Trader Birds Garden Ideas: Level 1
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Jai_Ganesha
Apr 10, 2017 2:06 AM CST
Yeah, it's pretty ubiquitous. Before Europeans landed in America some native tribes used the dried flowerheads to induce sneezing as a treatment for a congested nose.
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Name: kathy
Michigan
Zone 4b, near St. Clair MI
Cottage Gardener Lilies Organic Gardener
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katesflowers
Apr 15, 2017 3:34 PM CST
Thanks, jai
I noticed last year, in the large farm fields that surround us, that roundup treated fields eliminated every weed but this one. I wondered what it was. Now I know.
"Things won are done, joy's soul lies in the doing." Shakespeare
Name: Philip Becker
Fresno California (Zone 8a)
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Philipwonel
Apr 16, 2017 12:29 PM CST
Horseweed comes up all spring and summer. So after other weeds are gone... later sprouting horseweed has a free range. πŸ‡πŸ‡πŸ‡ yee ha !
😎😎😎
Anything i say, could be misrepresented, or wrong.
Name: Sandy B.
Ford River, Michigan UP (Zone 4b)
(Zone 4b-maybe 5a)
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Weedwhacker
Apr 16, 2017 10:27 PM CST
When I first saw this I thought it was about "horsetail" (Equisetum), but after googling horseweed I see these are two entirely different plants! Interesting -- and I think we have the "horseweed" as well as horsetail, but I never knew what it was called.

Just one more thing I've learned here! Smiling
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Name: kathy
Michigan
Zone 4b, near St. Clair MI
Cottage Gardener Lilies Organic Gardener
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katesflowers
Apr 17, 2017 11:12 AM CST
I have a big problem with the Great Horsetail (Equisetum telmateia subsp. telmateia). It produces spores this time of year and they blow everywhere ! While I pull the cone-like structures at the tip of the stems where the sporangiophores are located in the strobili, the spores also come to my garden from the farmer's fields up wind. I can't win !



Thumb of 2017-04-17/katesflowers/5238b4

"Things won are done, joy's soul lies in the doing." Shakespeare
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Apr 18, 2017 7:25 PM CST
Many years ago, when I was younger and my children were younger, we had 'logging' days. The days we went out and 'logged' the Horseweed and Lamb's Quarters - they were that big. The chickens loved the Lamb's Quarters but they wouldn't even get near the Horseweed.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

Webmaster: osnnv.org
Name: Jai or Jack
WV (Zone 6b)
Om shanti om.
Container Gardener Multi-Region Gardener Garden Photography Amaryllis Zinnias Gardens in Buckets
Region: Pennsylvania Annuals Houseplants Plant and/or Seed Trader Birds Garden Ideas: Level 1
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Jai_Ganesha
Apr 18, 2017 11:18 PM CST
My animals won't eat horseweed either. It is extremely successful because it tastes gross and it is hard to kill. lol
Keep going!
Name: Kabby
Lowndesboro, AL (Zone 8a)
Winter Sowing Region: United States of America Bookworm Echinacea Seed Starter Region: Alabama
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Kabby
May 21, 2017 1:35 PM CST
Jai I posted this plant on the ID forum a few weeks ago and horseweed was suggested.

Thumb of 2017-05-21/Kabby/5732a3

Is this similar to what y'all are talking about?
Name: Jai or Jack
WV (Zone 6b)
Om shanti om.
Container Gardener Multi-Region Gardener Garden Photography Amaryllis Zinnias Gardens in Buckets
Region: Pennsylvania Annuals Houseplants Plant and/or Seed Trader Birds Garden Ideas: Level 1
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Jai_Ganesha
May 21, 2017 1:49 PM CST
Yep. :)
Keep going!
Name: Kabby
Lowndesboro, AL (Zone 8a)
Winter Sowing Region: United States of America Bookworm Echinacea Seed Starter Region: Alabama
Plant and/or Seed Trader Dog Lover Birds Hummingbirder Butterflies Tropicals
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Kabby
May 21, 2017 5:58 PM CST
Thanks Jai, out it goes. Thumbs down
Name: Jai or Jack
WV (Zone 6b)
Om shanti om.
Container Gardener Multi-Region Gardener Garden Photography Amaryllis Zinnias Gardens in Buckets
Region: Pennsylvania Annuals Houseplants Plant and/or Seed Trader Birds Garden Ideas: Level 1
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Jai_Ganesha
May 22, 2017 2:36 AM CST
It is one of those things that I find persistent and inconvenient, though not altogether ugly.

In its own way it is actually kind of pretty because of its persistence.
Keep going!

geneshark
Feb 15, 2018 8:28 PM CST
I actually discover a couple of chemicals that can readily distinguish glyphosate resistant and sensitive horseweed. I also discover a couple of chemicals that can kill the resistant horseweed (fitness penalty) but not affect the sensitive variant at all. I am not working on herbicides and herbicide resistance any more. But it is very interesting to find so many could be done for better controlling weed species.

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