Rudbeckia triloba or giant ragweed?

kotabear5(7b)May 17, 2014

Tons of these have popped up around our yard over the past month. Currently about 2ft tall. Leaves and stems are green and hairy, but not prickly. I can't tell if they're rudbeckia triloba (fun) or giant ragweed (not fun).

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linaria_gw

Looks like leggy Rudbeckia triloba, does this one grow in part shade? My volunteers grow more compact but get full sun. And they do reseed very successfully, so very probably Rudbeckia

    Bookmark   May 17, 2014 at 3:38PM
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kotabear5(7b)

Thank you! Yep, lots of these all over shady parts of the yard.

    Bookmark   May 17, 2014 at 4:20PM
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esh_ga

Could also be Rudbeckia laciniata, cutleaf coneflower.

    Bookmark   May 17, 2014 at 10:01PM
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jeanne

I'm pretty sure that's giant ragweed, just one stem volunteering like that. It really does look similar to R. laciniata but if it was a single plant it would make more robust basal growth before sending up a stalk.

    Bookmark   May 18, 2014 at 10:49AM
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