What is this weed?

I have observed these growing in middle to north Georgia for the past few years. They grow in moist soil usually next to a stream or swamp but not right in the water. When they bloom the tiny flowers are pinkish, and butterflies, bumble bees, honey bees, wasps, etc., love them. The will be there day and night until the flowers wither. I have never seen them before when I stumbled upon them in the woods a few years ago and if you think a butterfly bush attracts butterflies you haven't seen any action like the one that this weed generates. I moved a couple of them to my house but they struggle due to lack of moist soil. Anyway if anyone knows what this is it would be nice to be able to identify this plant.
what is this weed, flowers, gardening, The butterfly weed
The butterfly weed!!!
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