I usually just leave mine and let nature do the thinning. Tracy

Leaves look right for r. nudiflora. Wise to be cautious. Bill Welch warns they're "nothing more than troublesome and persistent weeds." ... which seems a bit harsh. They will add a lot of weeding work within a typical flower bed or any neighboring lawn space, but have some nice attributes for the right locations. We keep some as host and nectar plants for several butterflies in an alley border where most of the seeds get washed down the storm drain. As ocgf mentioned, flowers don't last long, but foliage can pass as a very heat and drought tolerant ground cover. Responds well to mowing or trimming to reduce the weedy look. The photo shows a small patch we have in heavy shade at the base of an American beautyberry bush; it flowers only a bit less here than in full sun, so spreading volunteers still pose a challenge. This post was edited by bostedo on Mon, Jun 16, 14 at 1:09

Katy-did, You can dig and weed around native plants as long as you don't get TOO close. If a plant is kept in place, you could dig a weed as close as the outer edges of the leaves without damaging the roots too much. You could add woodland wildflowers in spots that currently have lawn grasses or weeds. You probably will find some weeds like dandelions, plantain, and other lawn weeds. You could dig these up and put new wildflowers instead. If there is not too much lawn grass to remove, then it could be done with small tools (hand trowel, etc) close to existing wildflowers. Larger areas could be turned over with a shovel. If you want to convert areas that don't have many wildflowers you can simply cover the grass and weeds with lots of fall leaves. The leaves will smother most of the grass and decay to enrich the soil and make it more like a woodland soil, which will help encourage woodland wildflowers. If you have an area with only a few wildflowers, you could move the wildflowers then either turn over the grass with a shovel then mulch with leaves, or simply mulch with leaves and wait. To move a wildflower dig up a piece of the ground with the wildflower in it and move it intact to a new location. I use a standard garden shovel to move a piece of ground about a foot in diameter at the surface and about a foot or s15 inches deep. This works for most large wildlfowers. For really small ones you could move a smaller piece of earth. If you keep the ground intact and therefore preserve the contact between the roots and the soil you should be able to move most wildflowers. Try to avoid separating the roots from the soil - there are many very small roots and even smaller strands of fungus that connect a root to the soil which are destroyed if a plant is moved bare root. Some plants will recover, but some may not so it is best to keep the soil and the plant together. Place the wildflower and soil in the ground so that the surface of the soil matches the surface in the new location, and carefully fill cracks around the edges of the soil ball with more soil.

When in doubt, give it a season and find out. Did the wildflower seed packet list the species? If not, that makes it more fun. By the way, the main reason I wanted to comment is just to say that you rock. You are the hero of the day. Ripping out a lawn and planting wildflower seed? It doesn't get any smarter, cheaper, or faster than that. What you just did should be required by law, enforceable by death, for everyone in America that still has a turf grass lawn.