Is this Cosmos or Weed

MilaSan(5)July 5, 2014

Hi All, Can someone let tell me if this is a cosmos or a weed? Thank you so much.

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missingtheobvious(Blue Ridge 7a)

Common/annual ragweed (Ambrosia artemisiifolia).

And next to it (lower right, far left, upper right) with the pointed leaves, is a Persicaria, perhaps Pennsylvania smartweed. It's a weed with an attractive flower, just waiting for the opportunity to take over your yard.

    Bookmark   July 5, 2014 at 10:58PM
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ken_adrian Adrian MI cold Z5

cosmo is much finer leaved .. leafed ... whatever.. lol

see link

you are new to the garden.. yes??? ... no good iris grower.. would allow anything to grow inside the iris ..

which would be my first clue.. that they are all weeds ... remove at will .. everything i see but the iris is a common weed ... [not talking about the deep background plants of which i cant focus on]

iris are rather shallow rooted.. we wouldnt want the competition ... for both water and nutrients ....

or think of it this way ... the blue iris leaves are rather architectural in their presentation ... when you can see them ... and thats with or without the flower ... so why dilute that presentation.. with a bunch of green ... even if they were good plants ... july/august is not a great time to be transplanting things... and you would never dig inside the iris to save something.. cosmo or not ...

clear everything for one foot around the iris.. including inside.. and enjoy the valuable plant ...


Here is a link that might be useful: link

    Bookmark   July 6, 2014 at 1:14PM
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Thank you all for your ideas, opinions, criticisms, but most importantly your advice.

This garden belongs to an elderly friend, whose husband is experiencing dementia. I'm trying to help them out, but since I have never planted cosmos from seeds, I couldn't id the plant as the cosmos that were planted.

I'll send some more photos as I continue to find treasures in their garden and I can label everything.

    Bookmark   July 8, 2014 at 4:45PM
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This community isn't about making people feel bad about their level of gardening expertise. Criticizing someone in the manner you have in your post above (and in other posts of yours I've seen) makes one think you are a not nice person.

This post was edited by jaynine on Tue, Jul 8, 14 at 18:38

    Bookmark   July 8, 2014 at 5:49PM
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I interpreted what Ken wrote to mean "is this particular garden new to you?"

    Bookmark   July 8, 2014 at 7:02PM
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agathafroo, your interpretation has given me a different view of the intention of the overall message of this particular post. Thank you.

    Bookmark   July 8, 2014 at 7:34PM
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TulsaRose, Tulsa OK(7a)

I thought Ken gave some very good advice to a new gardener. He is never deliberately mean-spirited which goes a long way in my opinion.

    Bookmark   July 9, 2014 at 7:40AM
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ken_adrian Adrian MI cold Z5

thx all ... it never fails to amaze me.. how the typed word can fail own i mean ....

no matter how hard one tries ...

heck.. i've gone back and read my own stuff.. and sometimes wondered what the heck i was talking about ... lol ..


    Bookmark   July 9, 2014 at 8:08AM
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It can be pretty easy to confuse ragweed with cosmos sulphureus....done it myself when they were seedlings and was pretty embarrassed when it bloomed. I do believe it is ragweed, and even if it were those big, honking old fashioned cosmos you do, as Ken says, want to keep it away from an iris planting. They want their rhizomes up and airy and not buried under anything. That being said...........if they do have cosmos planted and it does reseed don't want to weed the young ones out thinking they are ragweed. I've done that too. LOL. The link below shows how similar they can look.

Here is a link that might be useful: cosmos

    Bookmark   July 9, 2014 at 9:08PM
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stumbled across this Cosmos question,
I read through,

not sure, how is the vote, do you really think that this is Ambrosia?

I think the branching pattern is more typical for Cosmos sulphureus,

and according to the website attached, Ambrosia has hairy stems.

The aspect about the Iris is definitely valid, I am just not convinced about the Ambrosia

well, just curious, bye, Lin

Here is a link that might be useful: detailed pics of Ambrosia

    Bookmark   July 10, 2014 at 8:00AM
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and I just found this
not sure, seems to be a meta web site, collecting a large A-Z of all Asteraceae-pic (daysie-like plants), and probably other plant families, if you digg deeper.

quality seems to vary, but still, quite amazing,

and yes, if you bother to scroll, there are links to pics of Ambrosia arthemisifolia and Cosmos sulphureus

Here is a link that might be useful: Vascular Plant Image Library (quite posh, isn`t itâ¦)

    Bookmark   July 10, 2014 at 8:07AM
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Michaela .:. thegarden@902 .:. (Zone 5b - Iowa)

Glad I stumbled on this board, I have that pennsylvania smartweed growing alongside our garage in a garden I have not yet attempted to tackle. Will be ripping that out this weekend.

    Bookmark   July 10, 2014 at 2:44PM
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