What is this Wisconsin weed or plant?

kissproofgirlAugust 11, 2010

I thought I'd planted a dahlia where this huge plant started to grow. It has a very thick hollow stalk and is now 6 feet tall. I finally realized it's just a weed. But what weed? Thanks in advance to anyone who knows....

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Here are additional pictures. Help!

    Bookmark   August 12, 2010 at 10:18AM
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Could it be a delphinium? The leaves look similar and they produce a long hollow stalk.

    Bookmark   August 13, 2010 at 5:53PM
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pondwelr(z5 WI)

The leaf reminds me of wild lettuce or a bur plant of some sort. What is the infloresence at the tip? Maybe when it opens or blooms, you can better tell what it is. Pondy

    Bookmark   August 13, 2010 at 9:33PM
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giant ragweed---see link

Here is a link that might be useful: giant ragweed pics

    Bookmark   August 14, 2010 at 12:45AM
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It was indeed giant ragweed--I got it out just before it seeded.

    Bookmark   August 15, 2010 at 11:34AM
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