Plant ID forum: Giant weeds with white cottony top

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Pennsylvania
Njrwalk
Jul 4, 2017 5:42 PM CST
Lot behind our house has giant weeds that now are 6 feet tall and have gone to seed and are blowing their white puffy tops all over our yard . Could they be dandelions at 6 feet tall?
Thumb of 2017-07-04/Njrwalk/78740c

Name: Daisy I
Reno, Nv (Zone 6b)
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DaisyI
Jul 4, 2017 5:48 PM CST
Welcome!

Could you get a little closer and take a couple more photos? Do you remember seeing flowers?

My only guess with this photo is thistles.
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Name: greene
Savannah, GA (Sunset 28) (Zone 8b)
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greene
Jul 4, 2017 6:02 PM CST
Pull up one plant, lay it down on a plain surface and take clear photos so we have a better chance to identify the plant. Also, which part of Pennsylvania?

Oh, and every one of those cute little pieces of white fluff can become a new plant. Whatever your weed is, you need to eliminate it as quickly as possible to prevent the spread by seeds and by underground. I'm sure your neighbors will thank you. Thank You!

After you get rid of the plants, you might look into applying some pre-emergent product to prevent the spread of this pest.
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~"Leaf of Faith"
Name: Carol
Santa Ana, ca
Sunset zone 22, USDA zone 10 A.
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ctcarol
Jul 4, 2017 6:16 PM CST
Looks like thistle as best as I can tell from the blurry photo. There are lots of thistles...most with prickly leaves.
Name: Porkpal
Richmond, TX
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porkpal
Jul 5, 2017 7:54 AM CST
I've never seen a thistle that big.
Porkpal
Name: Carol
Santa Ana, ca
Sunset zone 22, USDA zone 10 A.
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ctcarol
Jul 5, 2017 12:49 PM CST
Porkpal, Lucky you!
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Jul 5, 2017 5:32 PM CST
Yeah! They can easily get 6 feet tall.
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: Carol
Santa Ana, ca
Sunset zone 22, USDA zone 10 A.
Charter ATP Member Hummingbirder Lover of wildlife (Black bear badge) Orchids Region: California Plant Identifier
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ctcarol
Jul 5, 2017 5:36 PM CST
And more! I have seen them in unimproved ranch land get around 8'...by the hundreds.
Name: Deb
Pacific NW (Zone 8b)
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Bonehead
Jul 5, 2017 5:37 PM CST
If they are thistles (which is my guess as well), the best way to get rid of them is to just keep wacking them back. If they don't go to seed, they eventually go away. But, those seeds can stay viable for a long time, so it's a process.
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Name: Carol
Santa Ana, ca
Sunset zone 22, USDA zone 10 A.
Charter ATP Member Hummingbirder Lover of wildlife (Black bear badge) Orchids Region: California Plant Identifier
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ctcarol
Jul 5, 2017 5:39 PM CST
Even RoundUp can require several applications. With all those seed heads you show, you have a battle on your hands.

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