That is the infamous chickweed! It grows any and everywhere. It even grows in the winter up here in the north and my chickweed seems to have grown underneath the four feet of snow we got this winter. Chickweed spreads through seed as well as it will propogate from any little bits of leaf or roots that are left behind after pulling it. The best way to get rid of it, is to smother it so that it can't get any sunlight. What I did for my chickweed situation, was a little bit of everything! I pulled my chickweed, sprayed everything that might be left behind with roundup, I put down Preen Mulched heavily and more preen on top. As more appears I will pull it. I plan to pulling the weeds and putting down plenty of preen before the chickweed goes to seed in the fall. I'm sure that by next year I will see a significant reduction in chickweed. I'm also composting the chickweed that I pull since it is very high in nutrients, and its edible too. If you're able to smother it with newspaper, weed cloth, or somthing of that sort the chickweed will decompose and put the nutrients back into your soil that it depleted. I'm planning on using weed and feed on my lawn so that any chickweed in the lawn will not spread to my beds.

Might also be one of Pedicularis species or something else, - put it into the soil, flowers will tell what is it.

Thank you! They are very easy to pull, but I just wondered if I was wasting my time because they are so prevalent throughout my yard. Do you know if mowing them stops them from flowering/seeding? The mowers came so now they are very hidden/short.

I do not know the name but I have some of the same weed. I sodded a portion of my front lawn this past spring with St Augustine Palmetto. I have hand removed a dozen or so pieces of this stuff in the new sod. Never saw it before the new sod.