A wonderful plant for the urban forager, chickweed grows in moist, shady spots---against foundations, under trees and beneath shrubs. It doesn't mind being trimmed and only grows back more enthusiastically than ever. It is a wonderful green for eating, both because of its high nutritional value and pleasant taste. I think of the flavor as similar to the freshest, mildest lettuce available, only juicier and more delicate. I use it as a lettuce substitute where I only need a small amount of greenery. I don't use it as a salad base alone because its small size makes it difficult to gather huge quantities at once but I use it in sandwiches and wraps and as a tasty addition to salads. My children love to dip it in ranch dressing and savor the crunchy little tidbits all by themselves. I also make a vinegar from the fresh plant and use it on salads and in soups. I have heard it is also delicious cooked but I like it so much raw I've never tried it.
Chickweed is also very valuable to the herbalist. I use the fresh leaves, crushed and moistened, for a variety of skin issues. I have found it to be especially helpful for inflamed, irritated skin and for gently drawing out impurities. I also often include it in herbal facial cream because it is very moisturizing as well as healing. It is considered a kidney tonic and a gentle diuretic and my experience bears this out. Traditionally chickweed has also been considered helpful for dissolving cysts, especially ovarian cysts. It is also considered by many herbalists to helpful for supporting weight loss efforts. The plant loses many of its beneficial qualities when dried so it is usually used fresh or made into a tincture or vinegar.
Although it is a very gentle plant, because of the saponins present in it, it is a mild laxative. It is unlikely a person would eat massive quantities of such a dainty plant but in that situation there is the possibility of being a little too...ahem..."regular."
As when wildcrafting any plant, use great care when identifying it. You may be able to find a gardener who can identify it for you---probably as a hated weed. If not, use at least three reputable sources---such as field guides, university websites or county extension materials---to help you with identification. Do not pick directly by a road, under power lines or anywhere there might be contamination from chemical sprays or lead paint.
I hope you will go out today and look for this lovely little plant. May she bring you as much good use and joy as she has brought me.