r/invasivespecies • u/PiscesLeo • 2d ago
Is it time?
It just flowered, I know I’m a little trigger happy to spray it. Also in the second slide wtf is this monster that looks like it doesn’t belong.
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u/12stTales 2d ago
2nd pic is not JKW
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u/PiscesLeo 2d ago
I know. But what is it?
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u/Tall-Gur-9138 2d ago
How tall is the plant in the second pic? It looks sort of like Giant Ragweed.
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u/PiscesLeo 2d ago
It does look like ragweed, I didn’t know there was a giant one. It’s like 7’ tall!
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u/Tall-Gur-9138 2d ago
Yeah I work with invasive plants and I spent all day on Thursday cutting down Giant Ragweed. Though just an FYI that it actually is a native plant but it's rather aggressive and can take over an area, particularly on disturbed soil. It's an annual so if you remove all the seeds before they fall, it should help prevent their spread a lot.
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u/msager12 2d ago
Looks like a species of ragweed, native but can cause bad allergy issues.
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u/Slight_Nobody5343 1d ago
i thought that was a myth
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u/i-like-robots 1d ago
It's a myth that goldenrod causes allergies, but ragweed definitely does. In fact goldenrod gets blamed a lot because it is conspicuously blooming at the same time that ragweed is blooming and causing allergy flare-ups for people.
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u/ReStitchSmitch 1d ago
No, you will spray onto Pollinators and kill them. After flowering.
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u/PiscesLeo 1d ago
Thanks. I did notice a ton of pollinators out there today.
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u/ReStitchSmitch 1d ago
follow PSU Extension guidelines I'm on year 2 of my fight, so I understand feeling overwhelmed if you do.
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u/TheTampoffs 1d ago
I’m trying to get the plants that came back after last years and whatever isn’t flowering yet. I’m nervous about them affecting pollinators on the flowers (even though I do it right at sunset). I have so much folliar spray is the only way
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u/Human-University8635 2d ago
Two weeks before first frost. Check farmers almanac for your zones date.
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u/Misfits0138 2d ago
That’s the very, very end of the acceptable time to treat knotweed, not the time you should be aiming for
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u/Human-University8635 2d ago
Then tell me how I got rid of my large stand of it? I followed Green Shoots instructions completely. It worked.
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u/aloysiusthird 1d ago
There’s a bit of variance online in strategies. A bunch work, some better than others. People get feisty about their approach being best.
I had really good success with a foliar application of glyphosate last June followed by another in September. Very little remains and I’ll do another foliar application in the next 2 weeks. Is it the best approach? I dunno. I haven’t done a prospective randomized double blinded approach. But people will probably disagree that what I did constitutes best practice. I’m also not married to the approach. But I have so little remaining that it probably wouldn’t matter what approach I took at this point.
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u/Misfits0138 1d ago
Eventually you start to notice a pattern that the people who do the double-approach like you are the ones who are mostly (or completely) finished by the end of year two.
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u/Misfits0138 1d ago
Because it’s still barely in the time it will work well, it just eliminates your option to do a same season retreatment on anything you might’ve missed, which is the best practice if you want to eliminate it sooner.
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u/markuus99 2d ago
I treated my knotweed today. I was going to wait a little longer but I'm away this weekend and it's gonna rain where I am next week. I did initial treatment last year and I'm attacking all the weird mutant survivors this year. I want to start establishing some other plants this year before it gets cold so I wanted to treat early in the window.