Chickweed, or satin flower, at Nash's Organic Producer. Photo copyright 2009 by Zachary D. Lyons.
Chickweed (Stellaria media) is probably taking over your spring garden bed as you read this, but surprising to most people is that the stuff you are throwing in the compost pile is actually a nice, tasty, grassy and nutrient-rich spring treat with many culinary applications. Native to Europe, it has become a prolific invasive weed in North America. It gets its name from the fact that chickens love to eat it, and I have never met a cockatiel that could resist it. It's like candy to them.
While chickweed has some medicinal uses, some advise caution in its ingestion due to its high nitrogen content.
For more information on chickweed, go to Wikipedia.