This looks like it's probably Creeping Charlie. We have a great Bug & Weed Identifier app that can help you figure out what weeds are around your house. You can use it to compare weeds you find to the ones the app has on file. And if you can't make a match, you can use the app to take a photo of the weed and send it to our experts to help in the identification of the weed. The app is entirely free. You can download it here for the iPhone: http://itunes.apple.com/us/app/spectracide-pest-guide/id450333348?mt=8 or here for Android: https://play.google.com/store/apps/details?id=com.spectracide.android&feature=search_result#?t=W251bGwsMSwyLDEsImNvbS5zcGVjdHJhY2lkZS5hbmRyb2l kIl0 For this particular case, we recommend Spectracideî Weed Stopî for Lawns. It's perfect for weeds growing in your lawn. You can find out more information and get a $2 rebate at https://www.facebook.com/Spectracide Hope this helps! Spectracide Expert Here is a link that might be useful: Spectracide info and special offers on Facebook

I had plenty of this weed in one part of my backyard last year. It does look like smart weed. I'm not sure why it's called smart weed--maybe because it's so pretty, you leave it alone and don't pull it. That's what I did last year; I never pulled it because it makes such a pretty ground cover--a nice thick green and pink ground covering. So nice looking. The only problem is this plant is an annual, so after producing seeds, it dies off every year. And when it dies off, all that is left behind is bare ground, unlike when Japanese clover dies off. I guess smart weed grows so thick and plush like a pretty carpet, that nothing can grow underneath it. So nowadays, I pull it when I see it because I don't like the bare ground it leaves behind when it dies every year. (It springs back next year because of the seeds it leaves behind.) When Japanese clover dies off each year, plenty of grass is left behind. So I guess smart weed isn't so smart after all :-)

Ok - I finally found out what this is - it's called mulberry weed.

Could be Acalypha, maybe A. virginica, also known as Three-Seeded Mercury. Frequent mowing will keep it from setting seed...maybe starve the roots.