Possibly prickly lettuce:
http://www.ppws.vt.edu/scott/weed_id/lacse.htm

Sue

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Zone 6, South-central PA


"Mark Anderson" wrote in message
.net...
This year I used an American Meadow Midwest Wildflower mix for my
wildflower boxes. Some of the wildflowers in the box came back from last
year. Usually I can recognize the typical weed (I.e. a local ugly plant
that shows up everywhere without being planted). This one plant I was
thinking of pulling about a month ago got huge broad leaves kind of like
a big dandelion. I let it grow and then it looked like it might be some
sort of big poppy. Now it has gotten huge and it doesn't look like a
poppy and it's taking up a lot of space in the box. I don't mind if it
turns into something nice but if it's just a nasty common weed I probably
should get it out of there.

Does anyone have an idea of what this is?

http://www.brandylion.com/images/weed.jpg


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As of June 8, major planting operations have ended.
Mission Accomplished!